To convert from Joules to Calories, use the conversion factor of 1 Cal = 4.184 J, so:
39.72 J / 4.184 J/Cal = 9.48 Cal
How solve the problem?These questions require calculations of heat energy transfer, which can be done using the formula:
Q = m * c * ΔT
Where:
Q = heat energy transfer in Joules
m = mass in grams
c = specific heat capacity in J/g°C
ΔT = change in temperature in °C
For the first part, a. Required to heat 5 grams of water from 5.5oC to 70oC:
m = 5 g
c for water = 4.18 J/g°C
ΔT = 70 - 5.5 = 64.5 °C
So, Q = m * c * ΔT = 5 * 4.18 * 64.5 = 1343.65 J
To convert from Joules to Calories, use the conversion factor of 1 Cal = 4.184 J, so:
1343.65 J / 4.184 J/Cal = 320.00 Cal
For the second part, b. Required to heat 10 grams of silver from 112oC to 275oC:
m = 10 g
c for silver = 0.24 J/g°C
ΔT = 275 - 112 = 163 °C
So, Q = m * c * ΔT = 10 * 0.24 * 163 = 39.72 J
To convert from Joules to Calories, use the conversion factor of 1 Cal = 4.184 J, so:
39.72 J / 4.184 J/Cal = 9.48 Cal
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based on their positions in the periodic table, predict which has the smallest atomic radius: mg, sr, si, cl, i.
Among the elements listed, Chlorine (Cl) has the smallest atomic radius. Chlorine is placed far right in the period and has the smallest atomic radius due to its high atomic number and resulting strong attraction of electrons to the nucleus.
Atomic radius refers to the size of an atom and is usually defined as the distance between the nucleus and the outermost shell of electrons. The size of an atom is determined by the number of electron shells and the energy level of the electrons.
As you move from left to right across a period (row) in the periodic table, the atomic number (number of protons) increases, which means there are more protons in the nucleus. The increased positive charge in the nucleus attracts the electrons more strongly, resulting in a smaller size.
Therefore, among the elements listed (Mg, Sr, Si, Cl, I), Cl, which is on the far right of the period, has the smallest atomic radius due to its high atomic number and resulting strong attraction of electrons to the nucleus.
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All organisms use oxidation-reduction reactions to harness energy, and this newly harvested energy is used to produce ATP. Oxidation is defined as the loss of electrons. Reduction is the gain of electrons. The energy in fuel molecules (often carbohydrates) is in the form of electrons. When electrons are removed from their high-energy state in fuel molecules (the electron donors), those molecules are oxidized. The electrons must be added to another molecule, which serves as the electron acceptor. As it gains electrons, the electron acceptor is reduced. When these electrons arrive at the final electron acceptor, they are at a lower-energy state compared to their original position in the electron donor. The goal is to harness the energy the electrons lose during this transfer process. In this activity, you will examine three equations and indicate which reactants are electron donors and which are receptors. In addition, you will identify the oxidized product and the reduced product.
The image below shows three different oxidation-reduction equations. Sort each of the lettered items on the image into the proper bin.
donors - a e i, acceptors - f b j, ox product -g c k, reduce product - d l h. The process of oxidation-reduction reactions in organisms involves the transfer of electrons from high-energy electron donors to low-energy electron acceptors
The electrons lost by the electron donor during this transfer provide the energy that is harnessed by the organism. This energy is then used to produce ATP. To identify the electron donors and acceptors in a reaction, it's important to examine the equation and determine which molecule is losing electrons and which molecule is gaining electrons. The oxidized product is the molecule that has lost electrons and the reduced product is the molecule that has gained electrons. The goal of this transfer is to harness the energy the electrons lose, providing energy to the organism.
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Complete question:
All organisms use oxidation-reduction reactions to harness energy, and this newly harvested energy is used to produce ATP. Oxidation is defined as the loss of electrons. Reduction is the gain of electrons. The energy in fuel molecules (often carbohydrates) is in the form of electrons. When electrons are removed from their high-energy state in fuel molecules (the electron donors), those molecules are oxidized. The electrons must be added to another molecule, which serves as the electron acceptor. As it gains electrons, the electron acceptor is reduced. When these electrons arrive at the final electron acceptor, they are at a lower-energy state compared to their original position in the electron donor. The goal is to harness the energy the electrons lose during this transfer process. In this activity, you will examine three equations and indicate which reactants are electron donors and which are receptors. In addition, you will identify the oxidized product and the reduced product.
The image below shows three different oxidation-reduction equations. Sort each of the lettered items on the image into the proper bin.
The reaction below has an expected yield of 58.0%. How much hydrochloric acid should be reacted with excess oxygen to produce 44.0 g of chlorine gas? 4HCI + O2 -> 2Cl2 + 2H20
44.0 g of Cl gas should be produced by reacting 78.0 g of hydrochloric acid with an excess of oxygen.
What is hydrochloric acid?Aqueous hydrogen chloride solutions are what we refer to as hydrochloric acid or muriatic acid. It has an extremely strong odor and is colorless.
Given Reaction is -
4HCl + O2 → 2Cl2 + 2H2O
36.5g. 32g. 71g. 18g
According to the reaction's stoichiometry,
1 g of HCl produces
= 142/436.5 g of Cl2.
Yet the anticipated yield is 58%. The amount of Cl2 will therefore be.
Cl2 = 142 × 58/100/4 * 36.5 g
Thus, we can conclude that 1 g of HCl produces 0.5641 g of Cl2.
Therefore, 1/0.5641g of HCl can be used to produce 1 g of Cl2.
Therefore, by =1 44.0/0.5641g
= 78.0 g of HCl, one can obtain 44.0 g of Cl2 gas.
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Selenium-83 has a half-life of 5 days. How many days would it take for a 10.0 mg sample to decay and have only 1.25 mg of it remain?
According to half life, it would take 15 days for selenium-83 to get reduced to 1.25 mg.
What is half-life?Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.
In 1st half life= 5 mg
In 2 nd half life= 10/2= 2.5 mg
In 3 rd half life= 5/2=1.25 mg
3 half lives = 3×5=15 days, thus, it would take 15 days for selenium-83 to get reduced to 1.25 mg.
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select the best answer for the molecular orbital into which an electron is placed when the radical anion of benzene is formed in the presence of sodium.
The MO theory predicts that the three molecular orbitals that pi electron of benzene occupy—y1, y2, and y3—have lower energies than an electron in a standalone p orbital. Over all six carbon nuclei.
Is benzene very poisonous?Because of the way that benzene makes the body's cells behave, poisoning can be fatal. The bone marrow cells' ability to make red blood cells can be affected by exposure to benzene, as can the immune system's white blood cells.
What does benzene serve as?Benzene is a typical industrial chemical. Benzene, a key ingredient in gasoline, can be found in crude oil. It is used to create a variety of products, including plastics, resins, synthetic textiles, rubber lubricants, dyes, detergents, and insecticides. Benzene is produced naturally by volcanoes and wild fires.
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Complete each row of the table below by filling in the missing pre
1 mol
1 M mol
1 m mol
1
mol
A
ha
10
10
= 10
= 10
0
0
-1
mol
mol
mol
mol
Н
X
5
Complete of row:
0.01 mol = 10⁻² mol1 M mol = 10³ mol1 m mol = 10⁻³ mol0,1 mol = 10⁻¹ molA mole is a unit of account for chemistry. The unit of account is used to facilitate the calculation of an object.
One mole of any substance will have the same number of particles, which is equal to 6.02 × 10²³ particles." For example, 1 mole of air contains 6.02 × 10²³ molecules of H₂O. 1 mole of oxygen gas contains 6.02 × 10²³ molecules of O.
The mole scale is needed as an indication of the amount of substance or compound, mole is the gram of substance divided by the relative molecular mass (Mr). The formula for calculating the moles of a compound is n = gram/Mr, in this case, n is the moles of the substance and gr is the mass of the substance.
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FILL THE BLANK Chemistry is the study of ______. (Select all the options that complete the sentence correctly.)
Chemistry is the study of:
a. the reactions between substances
c. matter
Chemistry is concerned with the study of matter and its properties, as well as the reactions between substances and the interactions between different substances and their behavior in different environments. The study of the forces that act on objects and the movement of objects falls under the realm of physics, not chemistry.
Chemists use various tools and techniques, such as spectroscopy and chromatography, to analyze and understand the behavior of substances. They also study chemical reactions and the transfer of energy during these reactions, which helps to explain why some reactions occur and others don't.
In addition to this, chemistry plays a crucial role in the development of new materials and processes through chemical synthesis. Chemists work to synthesize new materials with specific properties, such as increased strength or improved conductivity, which can have a wide range of applications in industries such as electronics, energy, and healthcare.
In conclusion, while chemistry has a broad range of applications, it primarily focuses on the study of matter and its reactions with other substances.
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combustion analysis of a 13.42-gg sample of the unknown organic compound (which contains only carbon, hydrogen, and oxygen) produced 36.86 gg co2co2 and 10.06 gg h2oh2o. the molar mass of the unknown compound is 288.38 g/molg/mol .
The unknown organic compound emphirical formula is C18H24O3.
The emphirical formula becomes C6O1H8
n = molar mass / emphirical formula mass
= 288.38 g/mol/(72+16+8) g/mol
=288.38/96 = 3
So molecular formula becomes = n * emphirical formula
= C18H24O3
The molecular formula is a way of expressing the number and types of atoms in a molecule. It is written as a combination of chemical symbols and subscripts and represents the actual composition of a molecule. The molecular formula provides information about the type of element that makes up a molecule and the number of atoms of each element present.
This information is critical for understanding the properties and behavior of a molecule and is used in many areas of science and engineering, including chemistry, biochemistry, pharmacology, and materials science. The molecular formula is also useful for identifying and synthesizing compounds, as well as for characterizing and determining the structure of molecules. In conclusion, the molecular formula is an essential tool for scientists and engineers, providing important information about the composition and properties of molecules.
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How much water is needed to be added into 500cm3 of 37% HCI solution to make a 1 mol dm-3 hydrochloric acid solution?
To convert 500 [tex]cm^{3}[/tex] of 37% hydrochloric acid solution to 1 mol [tex]dm^{-3}[/tex], we need to first determine the amount of hydrochloric acid present in the initial solution.
37% HCl means that 37 g of HCl is present in every 100 [tex]cm^{3}[/tex] of the solution. Hence, 500 [tex]cm^{3}[/tex] of the solution contains 37 × (500/100) = 185 g of HCl.
Since the molecular weight of HCl is 36.5 g/mol, 185 g of HCl is equivalent to 185/36.5 = 5.06 moles of HCl.
Now, to make a 1 mol [tex]dm^{-3}[/tex] solution, we need to have 1 mole of HCl in every [tex]dm^{3}[/tex] solution. As 500 cm^3 is equivalent to 0.5 [tex]dm^{-3}[/tex], we need to add 0.5 - 5.06 = -4.56 [tex]dm^{-3}[/tex] of water.
Since the volume can't be negative, we need to add 4.56 [tex]dm^{3}[/tex] of water, which is equal to 4.56 x 1000 = 4560 [tex]cm^{3}[/tex] of water.
What is volume?Volume is the amount of space a thing takes up, whereas capacity is a container's quality, specifically the amount of liquid it can hold. For instance, a rectangular aquarium has a capacity of 5 L since it can hold no more water than that amount.
The term "volume" describes how much room a thing occupies. In other words, just as height and breadth are ways to express size, volume is a measure of an object's size. The volume of an object is how much water it can store if it is hollow, or empty. Volume = mass divided by density is the formula for computing a substance's volume given its mass and density.
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the mass spectrum of an unknown compound shows the m peak at m/z 128. suggest its molecular formula (i) if it is a hydrocarbon; (ii) if it contains one oxygen atom
(i) If it is a hydrocarbon, the molecular formula can be determined by assuming that the peak at m/z 128 corresponds to the molecular ion (M+). The m/z 128 peak corresponds to M+, the molecular formula of the compound would be C8H16 (128 = 16 x 8).
(ii) If it contains one oxygen atom, the molecular formula can be determined by assuming that the peak at m/z 128 corresponds to the [M + 1]- ion. The m/z 128 peak corresponds to [M + 1]- the molecular formula of the compound would be C6H14O (128 = 14 + 16 + 16).
Hydrocarbons are organic compounds that are made up of only hydrogen and carbon atoms. They are the building blocks of organic chemistry and can be found in various forms, such as gases, liquids, and solids. The most common forms of hydrocarbons are methane, ethane, propane, butane, and pentane.
Hydrocarbons are widely used as fuel sources, as they are an important source of energy. They are also used as raw materials in the production of various chemicals, such as plastics, synthetic rubber, and detergents. Additionally, they play a critical role in the manufacturing of various household and industrial products, such as cosmetics, adhesives, and lubricants.
Hydrocarbons can be found in fossil fuels, such as coal, oil, and natural gas. The extraction and burning of these fossil fuels have had a significant impact on the environment, leading to air and water pollution, global warming, and other environmental issues.
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polar covalent o-h bonds in water molecules enable hydrogen bonds to form between water molecules. which of the following properties of water result from hydrogen bond formation?
High heat of vaporization, Surface tension, Adhesion, Cohesion, High specific heat are the properties of water result from hydrogen bond formation.
How are hydrogen bonds created?Covalent bonds develop when atoms share respective valence electrons. In covalent bonds, the electronegativity of the atoms controls whether they are polar or non-polar (the ability of an atom to attract electrons when in a bond).
In a non-polar covalent bond, electrons are spread uniformly.Imbalanced sharing of electrons happens in polar covalent bonds.How many hydrogen bonds may form among water molecules?Two lone pairs, two hydrogen atoms, and the moderately electronegative oxygen atom try to compensate each water molecule. This means that each water molecule can establish up to four bonds, two of which are h-bonds where it is the giver and two among which are h-bonds where it is the receiving end. But in liquid water, hydrogen bonds might form, break, and reconstruct readily because they are weaker than covalent interactions. The specific proportion of hydrogen bonds are formed by every molecule varies as a result.
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Compare solution A with pH 4 to solution B with pH 6.A.The concentration of hydronium ion in solution A is twice that in solution B.B. Solution A has greater buffering capacity than solution B.C. The concentration of hydronium ion in solution A is 100 times that in solution B.D. The hydroxide concentrations are equal in the two solutions since pH only measures the concentration of H+.
A pH 4 solution and a pH 6 solution are compared. Since pH solely measures the concentration of t, the concentrations of hydroxide are equivalent in the two solutions.
For instance, the acidity of pH 4 is 100 times (10 times 10) more than that of pH 6, and it is ten times higher than that of pH 5. The same is true for pH levels above 7, each of which is ten times more basic (or alkaline) than the next lower whole value. An acidic solution has a pH value of less than 7, whereas a basic solution has a pH value more than 7. Consequently, a solution with a pH of 6 is acidic and has a higher concentration of hydrogen ions than a solution with a pH of 8, which is basic.
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rank in order, from largest to smallest, the electric field strengths e1 to e5 at the five points in
Between the plates, the electric field is constant everywhere. The fact that the electric field vectors are uniform in size and direction serves as a clue. E1 = E2 = E3 = E4 = E5.
What direction does the electric field have at the dot?A radially outward (inward) pointed electric field is being produced by a positive (negative) point charge. By definition, the electric field's direction corresponds to the force acting on a positive test charge.
What is a diagram of an electric field?A curve has an arrow on it. Determining the electric field's direction from the two potential directions suggested by a tangent to the curve is obviously necessary.
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one of the following liquids is miscible with the organic solvent carbon tetrachloride, formula ccl4. identify the liquid. select the correct answer below: bromine, br2 water, h2o glycerol a molecular structure is shown. the contains a three carbon chain, with each carbon connected to upper o upper h. the two carbons on the ends are also connected to two upper h atoms. the middle carbon is only connected to one upper h atom. nitric acid, formula hno3
Being non-polar and a liquid at normal temperature, bromine, Br2, will mix with CCl4, another non-polar molecule.
Being non-polar and a liquid at normal temperature, bromine, Br2, will mix with CCl4, another non-polar molecule. While the others are all liquids at ambient temperature, their polar nature prevents them from mixing with CCl4. In contrast to ethanol and water, "CCl (4)" and "CCl (4)" are miscible in all amounts. Compare this behavior to the molecules of these substances. Nonpolar and organic solvents include carbon tetrachloride. Additionally a non-polar and organic solvent, benzoene. based on the similar-to-dissolve-like theory of solubility. Benzene and carbon tetrachloride are thus miscible liquids.
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The pH of a 1.00 × 10-2 M solution of cyanic acid (HOCN) is 2.77 at 25°C. Calculate Ka for HOCN from this result.
Ka of HOCN at the given data is 3.472 × 10-4.
The resulting value for the Ka of HOCN is 3.472 x 10⁻⁴.To calculate the Ka for HOCN, the following equation can be used: Ka = [H+][OCN-]/[HOCN].
The pH of the solution is 2.77, so [H+] = 10⁻²·⁷⁷ = 2.69 x 10⁻³ M.
Since [HOCN] = 1.00 x 10⁻² M, [OCN-] = [HOCN] - [H+].
Substituting the values into the equation gives:
Ka = [H+][OCN-]/[HOCN] = (2.69 x 10⁻³)(1.00 x 10⁻² - 2.69 x 10⁻³)/(1.00 x 10⁻²) = 3.472 x 10⁻⁴.
The Ka of HOCN is 3.472 x 10⁻⁴.
The pH of a solution can be used to determine the dissociation constant (Ka) of a weak acid. In the given case, the pH of a 1.00 x 10⁻² M solution of cyanic acid (HOCN) is 2.77 at 25°C. To calculate the Ka of HOCN, the concentration of the hydronium ions and the concentration of the weak acid need to be determined from the pH value. The relationship between the Ka, the weak acid concentration and the hydronium ion concentration can be used to solve for Ka. The resulting value for the Ka of HOCN is 3.472 x 10⁻⁴. This value can be used to predict the behavior of HOCN in solution, such as the degree of ionization and the reaction with other chemicals.
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Rank the following atoms in order of decreasing electronegativity.
a. Na, Li, K
b. K, Sc, Ca
c. As, Sn, S
In the first option , the order of decrease in electronegativity is Li, Na and K. In second option, the order is Ca, K, Sc The order in the third group is S, As, Sn.
What is electronegativity ?Electronegativity of an atom is the ability of its nucleus to attracts the share pair of electrons towards it. Elements like, fluorine, oxygen, nitrogen etc .are highly electronegative.
In periodic table, along a period electronegativity increases. Whereas down group, electronegativity decreases. The first groups elements are Li, Na , K and Cs and Fr. Hence, electronegativity decreases from Li to K.
Among, K, Sc and Ca, Ca is comparatively electronegative than K. Sc is a transition metal and not electronegative. In the last group the S is mot electronegative than As more than Sn.
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on the preceding graph, the green and blue lines represent the indifference curves of two investors, investor green and investor blue. what is an indifference curve?
Indifference curve is locus of points which represent return at given level of risk
No. Investor blue could move to a higher indifference curve and achieve a higher level of satisfaction (as we can see that higher return is possible for the same level of risk) A graphic illustration of the utility of an investment is the indifference curve. An indifference curve displays different risk-return pairings that an investor might be willing to take on in order to retain a specific level of utility. The indifference curve would have a negative slope for a risk-taking investor. Her usefulness grows as the danger and return increase. A risk-neutral investor would have an indifference curve that is exactly horizontal.
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The biosphere includes which of the following? Choose three that apply.
a. Trees and flowers
b. Water and cloud
c. Insects
d. Rocks and minerals
e. Bacteria
The biosphere includes the following below:
a. Trees and flowers
c. Insects
e. Bacteria
What is a Biosphere?This is referred to as the regions of the surface and atmosphere of the earth or another planet occupied by living organisms such as humans , animals etc.
The options chosen such as trees, bacteria etc are living organisms and is therefore the reason why they were chosen as the inhabitants of the biosphere in this scenario,
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9. A compound made of two elements, Iridium and Oxygen, was produced by heating
Iridium in air. It was found that the mass of Iridium was 1.26 g and the mas of Oxygen
was 0.210 g. what is the Empirical formula for the compound?
The empirical formula of the compound is Iridium:Oxygen = 1:2 or IrO2.
What is empirical formula?
The empirical formula of a compound is the simplest whole number ratio of its elements.
To find the empirical formula of this compound, we first need to convert the masses of Iridium and Oxygen to moles.
The molar mass of Iridium is 192 g/mol, so the number of moles of Iridium is:
1.26 g / 192 g/mol = 0.006562 mol
The molar mass of Oxygen is 16 g/mol, so the number of moles of Oxygen is:
0.210 g / 16 g/mol = 0.013125 mol
Next, divide each mole value by the smallest mole value (0.006562 mol), to get the mole ratio of the elements:
Iridium: 0.006562 mol / 0.006562 mol = 1
Oxygen: 0.013125 mol / 0.006562 mol = 2
So, the empirical formula of the compound is Iridium:Oxygen = 1:2 or
IrO2.
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12. In an experiment, a sample of an unknown, pure gaseous hydrocarbon was analyzed. Results showed that the sample contained 6.000 g of carbon and 1.344 g of hydrogen.(a) Determine the empirical formula of the hydrocarbon.(b) The density of the hydrocarbon at 25°C and 1.09 atm is 1.96 g L'.(i) Calculate the molar mass of the hydrocarbon.(ii) Determine the molecular formula of the hydrocarbon.In another experiment, liquid heptane, CH16 (1), is completely combusted to produce CO2(g) and H2O(!), as represented by the following equation.CH16(D)+11 O2(g) →7 CO2(g) +8 H2O(1)The heat of combustion, AH comb, for one mole of C,H16(D) is -4.85 x 10' kJ.(c) Using the information in the table below, calculate the value of AH, for CH16 (1) in kJ mol
a) The empirical formula of the hydrocarbon is therefore [tex]C_1H_{2.6}[/tex].
b) (i)The molar mass of the hydrocarbon can be calculated from its density is 196 g/mol and (ii) the molecular formula is [tex]C_{12} H_6[/tex].
c) The value of AH is [tex]-4.85*10^{3}[/tex] KJ/mol
(a) To determine the empirical formula of the hydrocarbon, the number of moles of carbon and hydrogen must be calculated, and the ratio of these moles should be expressed as the smallest whole numbers.
n(C) = [tex]\frac{6.000}{12.011} = 0.4992[/tex] mol
n(H) = [tex]\frac{1.344}{1.008} = 1.33[/tex] mol
The ratio of these moles is [tex]\frac{0.4992}{1.33} = 1:2.66[/tex]
The empirical formula of the hydrocarbon is therefore [tex]C_1H_{2.6}[/tex]
(b) (i) The molar mass of the hydrocarbon can be calculated from its density:
[tex]\frac{(1.96*1000)}{0.1} = 196[/tex] g/mol
(ii) To find the molecular formula of the hydrocarbon, divide the molar mass by the empirical formula mass and multiply all subscripts in the empirical formula by this ratio.
[tex]\frac{196}{(12.011+2(1.008)} = 16.0[/tex]
Multiplying the subscripts in the empirical formula by 16 yields the molecular formula: [tex]C_{12}H_6[/tex].
(c) To calculate the value, multiply the heat of combustion per mole of heptane by the number of moles:
[tex]-4.85*10^{3}*1[/tex] = -4.85 x 10^{3} kJ/mol
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1. you have been hired as a lab assistant in a major pharmaceutical company and your team leader has asked you to prepare several solutions. calculate how much of the solid reagent you would add to make the following solutions:
40.66 g of MgCl2 hexahydrate of solid reagent we would need to add to make the following:- (A) 125 mM Of Tris (B) 1.5 M of NaCl (C) 203.3 g of MgCl2 (D) 2 g of ampicillin (E) 142 g of lysozyme and for (F) it is given below.
(A) To make 250 ml of 0.5 M Tris,
you would need to add
= (0.5 M) x (250 ml)
= 125 mM of Tris.
(B) To make 0.3 L of a 5 M solution of NaCl,
you would need to add
= (5 M) x (0.3 L)
= 1.5 Moles of NaCl.
(C) To make 200 ml of a 1 M solution of MgCl2,
you need to first calculate the amount of MgCl2 hexahydrate required to make 1 M of MgCl2.
The molecular weight of MgCl2 hexahydrate is 203.3 g/mol.
So,
= (1 M) x (203.3 g/mol)
= 203.3 g of MgCl2 hexahydrate are needed to make 1 M of MgCl2.
To make 200 ml of a 1 M solution of MgCl2,
you would need
= (1 M) x (200 ml)
= 200 mM of MgCl2 hexahydrate,
= (200 mM) x (203.3 g/mol)
= 40.66 g of MgCl2 hexahydrate is the solid reagent.
(D) To make 20 ml of a 100 mg/ml solution of ampicillin,
you would need to add
= (100 mg/ml) x (20 ml)
= 2 g of ampicillin.
(E) To make 5 ml of a 2 µM solution of lysozyme,
you need to first calculate the molecular weight of lysozyme.
The molecular weight of lysozyme is 14.3 kDa,
= 14,300 g/mol.
So,
= (2 µM) x (5 ml) x (14,300 g/mol)
= 142 g
lysozyme are needed to make 5 ml of a 2 µM solution of lysozyme.
(F) To convert the following to liters:
5 nanoliters = 5 x 10^-9 L
25 microliters = 25 x 10^-6 L
30 milliliters = 0.03 L
10 deciliters = 1 L
5 kiloliters = 5000 L
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Question - 1. you have been hired as a lab assistant in a major pharmaceutical company and your team leader has asked you to prepare several solutions. calculate how much of the solid reagent you would add to make the following solutions:
(A) 250 ml of 0.5 M Tris.
(B) 0.3 L of a 5 M solution of NaCl.
(C) 200 ml of a 1 M MgCl2 from a bottle of Magnesium chloride hexahydrate.
(D) 20 ml of a 100 mg/ml solution of ampicillin
(E) five MLA offer two micromolar solution of lysozyme. Find molecular weight as mentioned above.
(F) convert using scientific notation to liters: 5 nanoliters, 25 microliters, 30 milliliters, 10 deciliters, 5 kiloliters.
suppose you start with gly fixed to the substrate. call this r1-coo- where the r1 stands for the solid substrate and all of gly except the coboxylic acid group. draw all of the resultant molecules when ala is allowed to react with the r1-coo-. be sure to include any charged atoms, assuming ph
When alanine (Ala) reacts with the substrate (r1-COO-), a peptide bond is formed between the carboxyl group of the substrate (COO-) and the amino group of the alanine (-NH3+).
This results in the formation of the molecule r1-Ala-COO-, where the "r1" indicates the solid substrate and "Ala" represents the alanine. At a neutral pH, the carboxyl group of the substrate will have a negative charge (COO-), while the amino group of alanine will have a positive charge (-NH3+). The formation of the peptide bond results in a molecule with a neutral charge.
It is important to note that the carboxyl group of the substrate and the amino group of alanine can react with other substrate or amino acid molecules to form additional peptide bonds, leading to the formation of longer peptide chains. This reaction is the basis of peptide synthesis and is used in the production of peptides, proteins, and other biologics.
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Use dimensional analysis to compute what volume of titanium (in cm3) would have a mass of 68.9186 grams. DO not include units in your answer, just the numeric part, and report your result to the correct number of significant figures.
The volume of titanium would have a mass of 68.9186 grams is 15.180 cm³.
What is volume ?The term volume is defined as the space occupied within the boundaries of an object in three-dimensional space. It is also known as the capacity of the object. Two examples of cubic units are cm3 or in3.
Given:
Density = 4.540 gm/cm3
mass = 68.9186 grams
Volume = ?
As we know the formula of density = mass / volume
Therefore, volume = mass / density
volume = 68.9186 gm / 4.540 gm/cm3
volume = 15.1803 cm³
Thus, the volume of titanium would have a mass of 68.9186 grams is 15.180 cm³.
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which of the following liquids would have the highest viscosity at the same temperature? group of answer choices ch3och3 ch3ch2nh2 ch3ch2br hoch2nh2
Since ethanol has the strongest intermolecular attractions and no other liquids have intermolecular H-bonding, ethanol has the highest viscosity.
Which molecule is more viscous, and how can you tell?Generally speaking, the viscosity of liquids increases with increasing intermolecular forces (IMF). Temperature and molecule structure are two more variables that affect viscosity. Higher average kinetic energy at higher temperatures will result in molecules moving more quickly. Lower viscosity will result from this.
What is high viscosity?The ability of a fluid to flow is determined by its viscosity. High viscosity fluids flow more slowly than low viscosity fluids due to their high resistance. In general terms, a fluid's viscosity decreases the more easily it travels.
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Identify the compound with a formula of C4H80 and a 1 H NMR spectrum of delta 1.1 (t, 3 H), delta 2.1 (s, 3H), and delta 2.5 (q, 2 H). * (1 Point) O CH3CH2CH2OCH3 O CH3CH2CH2CHO O CH3CH2CH2CH2OH O CH3CH2C(=O)CH3
CH3CH2C(=O) The molecule CH3 has the chemical formula C4H8O with a 1H NMR spectrum that looks like this: 1.1 (t, 3H), 2.1 (s, 3H), and 2.5. (q, 2H).
What group does C4H8O belong to?Isobutyraldehyde belongs to the group of propanals, which are propanals that have had their position 2 methyl group replaced. As a Saccharomyces cerevisiae metabolite, it serves a purpose. It is a 2-methyl-branched fatty aldehyde and a propanal.
Is C4H8O a component of organic matter?Having the chemical formula C4H8O, an organic molecule is a transparent liquid. Its structure is an open chain. zero carbon-carbon double bonds. It can either be an aldehyde or a ketone.
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How is carbon dioxide intrduced into the atmosphere
smoke
Explanation:
carbon dioxide is introduced into the atmosphere by burning of fossil fuels and forests
Mercury is the only metallic element that is a liquid at room temperature. When a drop of water is added into a container containing mercury, the water droplet remains on the surface of the mercury. Water and mercury are therefore __________.
Select the correct answer below:
miscible
partially miscible
Immiscible
Mercury and water are thus miscible. When a drop of water is introduced to a mercury-filled container, the water droplet stays on the mercury's surface.
Is water and mercury miscible?At normal temperatures, pure mercury is stable and does not tarnish. With most metals, it can create alloys. It does not dissolve in water or the majority of other liquids, but it does in lipids (fats and oils).
Why doesn't mercury dissolve in water?Since the cohesive interactions between mercury atoms and oil molecules are substantially greater than those between water molecules and mercury atoms, mercury is a liquid at room temperature and has a very low solubility in both.
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CONSUMER MATHEMATICS Computing a Percei mixture A chemist mixes 200 milliliters of a solution that is 55% acid with 425 milliliters of pure acid, Answer te questions below. Do not do any rcunding_ Mc# meny milliliters of acid are in the res Ulting mixture? Ei (6) Wnat Rertenlage cf the resulting mixture acid?
110 ml is equal to 5% of 200 ml. The total volume of the solution is 625 ml after mixing with 425 ml of pure acid. 425 + 110 = 535 ml make up the entire pure solution. The ratio is therefore (535*100)/625 = 85.6%.
Which of these three acids are they?Typically, acids can be categorised into three main groups. Binary acid comes in first, followed by oxyacid and carboxylic acid, respectively. All of the names of binary acids begin with "H-A," which stands for a hydrogen bond to a nonmetal atom.
A base and an acid are what?An acid is a chemical that, when dissolved in water, produces hydrogen ions (H+). When dissolved in water, a material produces hydroxide ions, or OH-.
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4. Molly walked into her house after school, and she could smell dinner cooking in her room as she worked on her homework.
a. Explain why she was able to smell dinner
b. Give two more examples of this behavior
Molly was able to smell dinner as the smell of food was perceived through her nose and interpreted by the brain , two more examples of this behavior are withdrawal of hand from hot object and running from site of danger after seeing it.
What is brain?The brain is defined as a complex organ which is capable of controlling various actions like thinking, memory,emotions, touch , huger and every regulatory process of our body.
Brain along with the spinal cord make up the central nervous system.The average adult brain is made up of 60% of fat and remaining 40 % comprises of water, carbohydrates, proteins and salts.
It has blood vessels and nerves which include neurons and glial cells.
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the functional group that forms covalent bonds between r groups within a polypeptide and that stabilizes tertiary structure is