Solvent-solvent forces, solute-solvent forces, and solute-solvent forces all play a role in determining solubility. As a result, the best choice is all of the above.
How is solubility determined?A substance's solubility is the greatest amount of a solute that can dissolve in a specific amount of solvent; it is influenced by the chemical makeup of the solvent and the solute as well as by temperature and pressure.
How is a solute determined to be soluble in a solvent?Generally speaking, polar solutes dissolve best in polar solvents, and nonpolar solutes dissolve best in nonpolar solvents, which are closest in molecular structure. Additionally, solutes will be easier to dissolve if their molecules are smaller than those of the solvent.
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balanced equation and calculate molarity of a solution of sodium hydroxide is 23.64 ml of this solution is needed to neutralize 0.5632g
The molarity of the sodium hydroxide solution is 0.65 M. The balanced chemical equation for the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is:
NaOH + HCl -> NaCl + H2O
The molarity of a solution of sodium hydroxide can be calculated using the equation:
molarity = (number of moles of solute) / (volume of solution in liters)
To determine the number of moles of NaOH in 23.64 ml of the solution, we need to first convert the volume to liters. Then, we can use the neutralization reaction to find the number of moles of HCl that reacted with the NaOH.
23.64 ml * (1 L / 1000 ml) = 0.0236 L
From the given information, 0.5632 g of HCl was neutralized by 23.64 ml of NaOH solution, so the number of moles of HCl is:
0.5632 g * (1 mole / 36.46 g) = 0.0154 moles
Since 1 mole of NaOH reacts with 1 mole of HCl, the number of moles of NaOH is equal to the number of moles of HCl, or 0.0154 moles. Finally, we can calculate the molarity of the NaOH solution:
molarity = (0.0154 moles) / (0.0236 L) = 0.65 M
So, the molarity of the sodium hydroxide solution is 0.65 M.
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Which of the following rate constants is negligible for the initial velocity (V 0) of an enzyme-catalyzed reaction?
k1.
k-1.
k2.
k-2.
In an enzyme-catalyzed reaction, the rate-limiting step is typically the binding of substrate to the active site of the enzyme. K2 and k-2 represent the rate constants for the formation and breakdown of the enzyme-substrate complex, respectively. These rate constants are important in determining the overall rate of the reaction, but they do not determine the initial velocity, which is largely determined by k1.
About Enzyme CatalyzedEnzyme Catalyzed is the increase in the rate of a process by a biomolecule. Such biomolecules are called enzymes, and most enzymes are proteins, while the processes they accelerate are mostly chemical reactions in the body.
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draw the radial probability functions r2r2(r) of the following atomic orbitals. be sure to indicate which curve corresponds to which orbital and label your axes.
The graphs for the radial probability functions r2r2(r) of the atomic orbitals can be made using the information provided below.
The radial probability function (rR2(r)) represents the probability of finding an electron in an orbital at a certain distance from the nucleus. The radial probability function can be used to visualize the size and shape of atomic orbitals. The values of the radial probability function are proportional to the square of the radial wave function.
For s-orbitals (1s, 2s, 3s, 4s), the radial probability functions are spherically symmetrical and centered on the nucleus. They decrease rapidly with increasing distance from the nucleus, reaching zero at a certain distance. The 1s orbital is the smallest and has the highest probability of finding an electron close to the nucleus. The 2s orbital is larger than the 1s orbital and has a lower probability of finding an electron close to the nucleus. Similarly, the 3s and 4s orbitals are larger and have lower probabilities of finding an electron close to the nucleus.
For p-orbitals (3p), the radial probability functions are not spherically symmetrical and have a nodal plane where the probability of finding an electron is zero. They have a maximum probability at a certain distance from the nucleus and decrease rapidly with increasing distance from the nucleus.
For d-orbitals (3d), the radial probability functions have more complex shapes with several nodal planes where the probability of finding an electron is zero. They have maxima and minima at different distances from the nucleus.
For f-orbitals (4f), the radial probability functions have even more complex shapes with multiple nodal planes and regions of maximum and minimum probability. The 4f orbitals are larger and have a lower probability of finding an electron close to the nucleus compared to the 3d orbitals.
The inclusion of relativistic effects in the calculations of the radial probability functions can result in differences in the shapes of the functions for s and f orbitals. However, the inclusion of relativistic effects does not significantly affect the shapes of the p and d orbitals.
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The complete question is:
Draw the radial probability functions rR2(r) of the following atomic orbitals Be sure to indicate which curve corresponds to which orbital and label your axes 1s, 2$, & 3s on the same graph b_ 3s, 3p, & 3d on the same graph 4s without relativistic effects and 4s with relativistic effects, on the same graph d. 4f without relativistic effects and 4f with relativistic effects, on the same graph.
at elevated temperatures, sodium chlroate deocmpsoes to produce sodium chloride and oxygen gas a 0.8765 g sample of impure sodiujm chlorate was heated until the production of oxygen gas ceased he oxygen gas collecte dover water occupied
When sodium chlorate is heated at elevated temperatures, it decomposes to form sodium chloride and oxygen gas.
In the experiment, a 0.8765 g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen gas collected over water occupied a volume of 45.74 mL at a temperature of 20°C and a pressure of 745 mmHg.
The number of moles of oxygen gas collected can be calculated using the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Thus, the number of moles of oxygen gas produced is 0.0059 moles.
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which of the following bonds has the ability to rotate? n (amide) to c (alpha) c (alpha) to c (carbonyl) c (carbonyl) to n (amide)
N (amide) to C (alpha), (b) C (alpha) to C (carbonyl).
Do amide bonds spin around?The chemically unequal nitrogen protons exchange as the amide bond spins. The ensuing dynamic NMR spectra offer a potent and well-proven method for deriving the kinetic parameters using variable-temperature NMR experiments because they are quite sensitive to the pace of this exchange.
Which bond types are present in amide?Peptide bonds include amide bonds. It is created when the carboxyl group of one amino acid bonds with the amine group of another amino acid, losing one water molecule in the process.
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Predict the products for each reaction in Column A. Write the Formulas for these prod- ucts on the product side of each equation In the space at the left, write the letter of the choice from Column B that indicates what type of product is produced during the reac- tion shown in Column A. Write as many choices as apply: (Hints: Compounds of group metals are never precipitates; H,S and COz are gases )
The formulas for these products on the product side of each equation:
water (c) 9. HBr (aq) + KOH (aq) → KBr + [tex]H_{2}O[/tex] (l)
gas, water (a,c) 10. [tex]HNO_{3}[/tex] (aq) + [tex]Na_{2}CO_{3}[/tex] (aq) → [tex]NaNO_{3}[/tex] (Aq) + [tex]H_{2}O[/tex] (l) + [tex]CO_{2}[/tex] (g)
precipitate (b) 11. NaI (aq) + Pb([tex]C_{2}H_{3}O_{3}[/tex]) (q) → [tex]NaC_{2} H_{3}O_{2}[/tex] (aq) + [tex]PbI_{2}[/tex]PbI2 (s)
water (c) 12. CsOH (aq) + [tex]H_{2}SO_{4}[/tex] (aq) → [tex]Cs_{2}SO_{4}[/tex] (aq) + [tex]H_{2}O[/tex] (l)
gas (a) 13. [tex]K_{2}S[/tex] (aq) + HCl (aq) → KCl (Aq) + [tex]H_{2}S[/tex] (g)
Precipitаtes аre insoluble ionic solid products of а reаction, formed when certаin cаtions аnd аnions combine in аn аqueous solution. The determining fаctors of the formаtion of а precipitаte cаn vаry. Some reаctions depend on temperаture, such аs solutions used for buffers, whereаs others аre dependent only on solution concentrаtion. The solids produced in precipitаte reаctions аre crystаlline solids, аnd cаn be suspended throughout the liquid or fаll to the bottom of the solution. The remаining fluid is cаlled supernаtаnt liquid. The two components of the mixture (precipitаte аnd supernаte) cаn be sepаrаted by vаrious methods, such аs filtrаtion, centrifuging, or decаnting.
Your questions are incomplete, but most probably your full questions can be seen in the Attachment.
Thus, the correct options are
9. c
10. a, c
11. b
12. c
13. a
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the main reason that ch3oh has a higher boiling point than ch3sh is that ch3oh blank.target 1 of 3 the main reason that ch3ch3 has a higher boiling point than ch4 is that ch3ch3 blank.target 2 of 3 the main reason that cse2 has a higher boiling point than cs2 is that cse2 blan
Explanation:
Target 1 of 3: has hydrogen-bonding interactions.
Target 2 of 3: has dipole-dipole interactions.
Target 3 of 3: has stronger London dispersion forces.
which of the following pairs list a set of miscible liquids. x. octane (c8h18) and water y. acetic acid (ch3cooh) and water z. octane (c8h18) and cyclohexane (c6h12)
Pairs of miscible liquids include acetic acid (CH₃COOH), water, octane (C8H18), and carbon tetrachloride (CCl₄).
What kind of liquids mix easily?Miscible liquids are defined as substances that combine and form one layer when left undisturbed for a while. Consider how alcohol and water interact. Ethenyl acetate has a low dielectric constant. Water, on the other hand, has a comparatively high dielectric constant.
Miscible liquids are those that can easily combine to create a homogeneous solution. Examples are milk with water and alcohol. Liquids that are immiscible do not combine to form a single phase. Example: Honey, oil, and water—the oil floats on top of the water.
Are acetone and water miscible?Acetone is one of the most widely used organic solvents and has many applications in both research and business. The majority of these applications take advantage of the well-known fact that acetone and water can be combined in any ratio in ambient conditions.
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when an object is burned what happens to its matter
Answer: The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction.
Explanation:
For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
the number of molecules whose activation energy is high enough to react is greater as temperature increases.True or False
The statement "the number of molecules whose activation energy is high enough to react is greater as temperature increases" is TRUE.
The number of molecules whose activation energy is high enough to react is greater as temperature increases. This is because the increase in temperature results in an increase in the kinetic energy of the molecules, which makes more of them have sufficient energy to overcome the activation energy required for a reaction to occur. As a result, the reaction rate increases with an increase in temperature. This relationship is known as the Arrhenius equation and is widely used in the field of chemical kinetics to describe the effect of temperature on reaction rate.
The activation energy is a measure of the minimum energy required for a reaction to occur. It represents the energy barrier that must be overcome in order for a reaction to occur. When the temperature is increased, the kinetic energy of the molecules also increases, making it more likely for them to have enough energy to overcome the activation energy. This results in an increase in the number of molecules with sufficient energy to react, and therefore an increase in the reaction rate.
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The volume of the wood is
3.86
Correct unit
select which of the following fibers would be most likely to have been made from polymers and have a uniform, smooth appearance. (check all that apply) select which of the following fibers would be most likely to have been made from polymers and have a uniform, smooth appearance. (check all that apply) cotton polyester coir mohair acrylic nylon
Nylon & polyester polymers are mostly used in the textile sector.Both of these polymers are utilized in the textiles industry for the production of clothing.shortly following manufacturing, in a disorganized, random state.
What kind of fabrics are made of polymers?Polymer fibers are a subclass of artificial fibers that are created using solely physical processes from synthetic chemicals rather than natural materials (typically from petrochemical sources).These fibers are created from nylon polyamide. polyester in PET or PBT.
What three categories of polymers are there?Thermoplastics, thermosets, & elastomers are the three main categories of polymers.The best way to distinguish between these types is by how they behave when heated.
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an alloy is a mixture of metals. suppose that a certain alloy is made by mixing 300 grams of an alloy that contains 72% copper with 20 grams of pure copper. answer the questions below. do not do any rounding.
The resulting alloy mixture the copper is 73.75% or 236 grams copper in the resulting alloy mixture.
= 300 x 72%
= 300 x 70/100
= 216
Resulting mixture = 300 + 20 = 320
= 216 + 20 / 320 x 100
= 236/320 x 100
= 295/4
= 73.75%
i. 236 gram copper in the resulting mixture.
ii. 73.75% copper in resulting mixture.
An alloy is a mixture of two or more elements, where at least one of the elements is a metal. These alloys have different properties compared to their pure metal counterparts and are used in a variety of applications. For example, steel is an alloy made up of iron and carbon, which is stronger and more durable than pure iron. Other common alloys include brass (copper and zinc), bronze (copper and tin), and aluminum (aluminum and other elements).
The specific combination of elements and the ratios in which they are mixed determine the properties of the alloy. These properties can include strength, durability, resistance to corrosion, and electrical conductivity. Alloys are widely used in the manufacturing of various products, from automobiles and buildings to medical devices and electronics. With the ability to tailor the properties of alloys, they play a crucial role in many technological advancements and industries.
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Interactive Worked Example 11.2 Hydrogen Bonding
Part A
Which has the higher boiling point, HF or HCL? Why?
Match the compounds in the left column to the appropriate blanks in the sentence on the right. Make certain each sentence is complete before submitting your answer
_______ has a higher boiling point than _______ because, unlike ________, _________ is able to form hydrogen bonds. The hydrogen bond is the strongest of the intermolecular forces and requires more energy to break
Because it can form hydrogen bonds unlike HF, HCl has a higher boiling point than HF. The strongest intermolecular force is the hydrogen bond, which takes more energy to break than any other force.
Why does HCl have a high boiling point?
The fact that HCl has a higher normal boiling point than F2 (188 K vs. 85 K) is due to the dipole-dipole attractions between HCl molecules being stronger than those between nonpolar F2 molecules.
Do HCl's boiling points range from high to low?
Moving on to HBr and HI, the molecules get bigger, the van der Waal forces get stronger, and the boiling point gets hotter. HCl has the lowest boiling point as a result.
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Answer my question please.
Let the electron configurations from top to down be labeled A - G
A - P
B - S
C - Ca
D - Br
E - C
F - Al
G - Co
What is electron configuration?Electron configuration refers to the arrangement of electrons in an atom. It describes the distribution of electrons in the various atomic orbitals of an element, including the energy levels and subshells occupied by electrons. The electron configuration is written using the notation of the element's atomic number, its symbol, and a set of superscripts indicating the number of electrons in each orbital.
For example, the electron configuration of carbon (atomic number 6) can be written as 1s2 2s2 2p2. This indicates that carbon has two electrons in the first energy level (1s), two electrons in the second energy level (2s), and two electrons in the second level's second subshell (2p).
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which of these substances will not form a covalent network solid? select the correct answer below: carbon dioxide silicon silicon dioxide carbon graphite
The correct answer is that Carbon Dioxide will not form the covalent network solid.
At normal pressure and temperature, carbon dioxide is a colorless, non-flammable gas. Carbon dioxide has a significant role in the composition of our planet's air, while being far less prevalent than nitrogen and oxygen in the atmosphere. One carbon atom and two oxygen atoms make up the molecules of carbon dioxide (CO2).Polar covalent bonds are the kind of bonds that exist between the atoms of a carbon dioxide molecule. A carbon atom is bonded to two oxygen atoms in a carbon dioxide molecule by four covalent connections, with each oxygen atom having two covalent links. No attraction between solvent molecules and carbon atoms is likely to be stronger than the attraction between covalently bonded carbon atoms.
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which statement best describes electrons? responses electrons reside in the nucleus. electrons reside in the nucleus. electrons are composed of protons and neutrons. electrons are composed of protons and neutrons. electrons have a positive charge. electrons have a positive charge. electrons orbit around the nucleus.
Answer:
Electrons reside in the nucleus
Explanation:
feaAnswer:
Im from k12 its B
Ex
please select all plausible lewis dot structures which are theoretically possible. note: this question has multiple correct answers.
A Lewis dot structure is a representation of the valence electrons of an atom or molecule.
The dots represent the electrons in the outermost shell, and it is possible to draw multiple Lewis dot structures for a molecule if there are different arrangements of valence electrons that are theoretically possible.
For example, for the molecule BF3, the following Lewis dot structures are possible:
(i)
F : B : F
: ::
. . . .
(ii)
F : B :: F
: :
. . . .
(iii)
F : B : : F
: .
. . . .
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Given the reactions and overall heats of combustion of four cyclic rings, calculate the heat of combustion per CH, group. Compound Combustion reaction AH for reaction (kJ/mol) AH per CH2 group (kJ/mol) cyclohexane CH 2 +902 6CO2 + 6H 0 -3920 cycloheptane C,H, 4 + 2102 7 C02 + 7H0 -4599 cyclooctane CH16 + 120, 8 CO2 + 8H,O -5267 cyclononane C,H18+ *102 — 900, +9H,0 -5933 AH per CH, for cyclohexane: kJ/mol AH per CH, for cycloheptane: KJ/mol AH per CH, for cyclooctane: kJ/mol AH per CH, for cyclononane: kJ/mol Which is the most stable cycloalkane? O cyclohexane O cycloheptane O cyclononane O cyclooctane
The most stable cycloalkane among the four options is cyclooctane. The stability of a molecule can be estimated by its heat of combustion per CH2 group, which represents the amount of energy released when the molecule is burned completely. A lower heat of combustion per CH2 group indicates that the molecule is more stable, as it requires less energy to break the bonds between its atoms. The heat of combustion per CH2 group for cyclooctane is -5267 kJ/mol, which is the lowest among the four options, indicating that it is the most stable.
Stability of a molecule can be estimated by its heat of combustion per CH2 group, which represents the amount of energy released when the molecule is burned completely. The lower the heat of combustion per CH2 group, the more stable the molecule is, as it requires less energy to break the bonds between its atoms. In the given options of cyclohexane, cycloheptane, cyclooctane and cyclononane, cyclooctane has the lowest heat of combustion per CH2 group (-5267 kJ/mol), indicating that it is the most stable. This suggests that cyclooctane has a more favorable distribution of energy within its molecular structure compared to the other three options.
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suppose you are asked to find the area of a rectangle that is 2.1- cmcm wide by 5.6- cmcm long. your calculator answer would be 11.76 cm2cm2 . now suppose you are asked to enter the answer to two significant figures. (note that if you do not round your answer to two significant figures, your answer will fall outside of the grading tolerance and be graded as incorrect.) enter your answer to two significant figures and include the appropriate units. activate to select the appropriates template from the following choices. operate up and down arrow for selection and press enter to choose the input value typeactivate to select the appropriates symbol from the following choices. operate up and down arrow for selection and press enter to choose the input value type nothingnothing
11.76 cm² to two significant figures will give the area of the rectangle as 11.8 cm².
How to reduce numbers to two significant figures?To reduce a number to two significant figures, you need to perform the following steps:
Determine the first significant figure by finding the first non-zero digit from the left.Count the total number of digits after the first significant figure.If there are more than two digits after the first significant figure, round the number to the second significant figure.If there are less than two digits after the first significant figure, leave the number as is.To reduce 11.76 to two significant figures, you need to determine the first two non-zero digits and the location of the decimal point. The first two non-zero digits are 11, and the decimal point is between the 1 and the 7. Therefore, the reduced number is 11.8 (since the rounding rule is to round up if the third digit is 5 or greater). So, 11.76 reduced to two significant figures is 11.8 cm².
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Select all the statements that correctly describe the formation of sp hybrid orbitals. Check all that apply. The formation of sp hybrid orbitals leaves one unhybridized p orbital. An sp hybrid orbital is identical to an sp hybrid orbital in shape and energy. Three sp² hybrid orbitals are formed by the hybridization of one s and one p orbital. A group of sp hybrid orbitals assumes a trigonal planar geometry
a group of sp^2 hybrid orbitals assumes a trigonal planar geometry.the formation of sp^2 hybrid orbitals leaves one unhybridized valence p orbital.
How are sp hybrid orbitals made?1 s one and p atomic mix to produce sp hybridization, two s and two p atom orbitals mix to produce sp2 hybridization, and three s and 3 p atomic orbitals mix to produce sp3 hybridization.
What is the proper terminology for sp hybridization?One s orbital one and p orbital combine to generate two sp orbital angular momentum, each of which has 50% s character & 50% p character. This process is known as sp hybridization.Every time an atom is accompanied by 2 groups of electrons, this kind of hybridization is necessary.
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7. The states of matter are also included in many balanced equations. Describe the similarities and differences between the notations: (l) and (aq).
A liquid is any fluid that is practically incompressible, whereas an aqueous substance is a liquid that contains the solvent water.
What is states of matter?The different arrangements of certain particle groups under varied stresses and temperatures are referred to as states of matter. There are only three classical states of matter: solid, liquid, as well as gas. Historically, such descriptions have concentrated on a material's structure and volume.
While all liquids are, by definition, liquids, not all liquids seem to be aqueous solutions. The main distinction between a liquid and an aqueous substance is that a liquid is any fluid that is practically incompressible, whereas an aqueous substance is a liquid that contains the solvent water.
Therefore, a liquid is any fluid that is practically incompressible, whereas an aqueous substance is a liquid that contains the solvent water.
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Write a balanced equation and K₁, expression for the following Brønsted-Lowry base in water:
acetylide ion, HC=C. Include the states of all reactants and products in your equation.
A balanced equation may be used to describe this reaction:
HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)
What is Brønsted-Lowry base?The Brnsted-Lowry hypothesis is an acid-base reaction theory that was separately proposed in 1923 by Johannes Nicolaus Brnsted and Thomas Martin Lowry. In a chemistry, a Brnsted-Lowry base is a molecule or ion that accepts a hydrogen ion. Because a hydrogen ion is often referred to as a proton, acids and bases are proton donors and acceptors, according to the Brnsted-Lowry definition.
Here,
The acetylide ion (HC=C) acts as a Brønsted-Lowry base in water, accepting a proton from water to form an acetylene cation (H3C+C-):
HC=C + H2O ⇌ H3C+C- + OH-
This reaction can be written as a balanced equation:
HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)
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which of the following diagrams correctly displays the polarization of a metal sphere by an electric field that points to the left, using the conventions discussed in the matter and interactions textbook?
According to the Matter and Interactions textbook, the correct diagram that displays the polarization of a metal sphere by an electric field that points to the left is diagram B in the figure.
Diagram B shows a metal sphere with a positive charge at the top and a negative charge at the bottom, with the electric field pointing to the left.
When a metal sphere is placed in an electric field, the field causes the positive charges in the metal to move to the side facing the field and the negative charges to the side facing away from the field.
This creates an induced electric dipole in the metal, where the positive side of the dipole is facing the field and the negative side is facing away from the field. This phenomenon is called polarization.
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If a H2 sample has a diffusion rate of 955 m/s, what is the rate of a Cl2 sample at the same temperature?
If a H₂ sample has a diffusion rate of 955 m/s, 5.95 is the rate of a Cl2 sample at the same temperature.
What is Grahm's law of diffusion ?Graham's law states that a gas's rate of diffusion or effusion is inversely proportional to its molar mass squared. The Formula can be written as follows. M1 denotes the molar mass of gas. 1. M2 denotes the molar mass of gas. 2. Rate1 is the rate of the first gas's effusion.
It supports in the separation of gases with varying densities. It aids in the separation of certain element isotopes. It aids in determining the molecular weight of an unknown gas by utilizing effusion rates.
According to Grahm's law of diffusion
rate (gas A) × √molar mass(gas A) = rate(gas B) × √molar mass (gas B)
For H₂ gas and Cl₂ gas
r H₂ / r Cl₂ = √molar mass of Cl₂ / molar mass of H₂
= √70.90 / 2
= √35.45
= 5.95
Thus, If a H₂ sample has a diffusion rate of 955 m/s, 5.95 is the rate of a Cl2 sample at the same temperature.
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Question 2(Multiple Choice Worth 4 points)
(05.03 LC)
Which of the following is a correct empirical formula if the ratio is 1:1:3?
OCC13
O CFC13
O FeS3
OK3CO3
Answer:
C
Explanation:
Answer: B. CFCl3
Explanation:
Look at the amount of moles in the compound.
1 mol C (Carbon)
1 mol F (Fluorine)
3 mol Cl (Chlorine)
You can see that the ratio is 1:1:3 according to the subscripts and moles of each element.
Also, I took the exam and got it right!
How many grams of CaH2 are needed to generate 147 L of H₂ gas if the pressure of H₂ is 827 torr at 22 °C?
Express your answer using three significant figures.
133.0g of CaH[tex]_2[/tex] are needed to generate 147 L of H₂ gas if the pressure of H₂ is 827 torr at 22 °C.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created.
The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear. To fill this gap between extremely small and extremely huge numbers, scientists created the mole.
CaH[tex]_2[/tex] + 2H[tex]_2[/tex]O → Ca(OH)[tex]_2[/tex] + 2H[tex]_2[/tex]
n = PV/RT = (827torr)×(147L)/((62.36367L×Torr/K*mol)×(20+273K))
= 6.6531 mol H[tex]_2[/tex]
mole of CaH[tex]_2[/tex] = 6.6531 /2=3.32moles
mass of CaH[tex]_2[/tex] =3.32×40.08=133.0g
Therefore, 133.0g of CaH[tex]_2[/tex] are needed to generate 147 L of H₂ gas if the pressure of H₂ is 827 torr at 22 °C.
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identify the reactant acid and base in each of the following reactions by letters. 1. the acid is fill in the blank 1 the base is fill in the blank 2 2. the acid is fill in the blank 3 the base is fill in the blank 4
1. The acid is HCl (a) and the base is Na+ (b)
2. The acid is H3C-OH (a) and the base is NH2- (c)
In an acid-base reaction, an acid donates a hydrogen ion (H+) to a base, which accepts it. In the reaction, HCl (a) donates a hydrogen ion to Na+(b), which accepts it, forming NaCl (d) and HCN (e). This reaction is a classic example of a neutralization reaction, where an acid and a base react to form salt and water.
Acid-base reactions involve the transfer of a proton (H+) from an acid to a base. In the first reaction, H3C-OH (a) is the acid as it donates a proton to the base, which is Na+ (b). This results in the formation of H3C-O-(d), a salt, and Na+(e), which is now the conjugate base of the original acid.
In the second reaction, H3C-OH (a) still donates a proton to the new base, which is now NH2- (c), forming H3C-O-(d) and NH3 (f). NH3 (f) is the conjugate base of the original acid, H3C-OH (a).
It's important to note that an acid must have a hydrogen ion (H+) that can be donated, and a base must have an available lone pair of electrons to accept a proton in order for an acid-base reaction to occur.
Learn more about acid-base reactions here:
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The complete question is:
Identify the reactant acid and base in each of the following reactions by letters.
1. HCl (a) + Na+(b) CN- (c) -> Na+(f) Cl-(d) + HCN(e)
The acid is ___.
The base is ___.
2. H3C-OH(a) + Na+(b) NH2-(c) -> H3C-O-(d) Na+(e) + NH3(f)
The acid is ___.
The base is ___.
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an ionic bond is one in which . group of answer choices two charged atoms have a mutual attraction due to a transfer of electrons electrons are shared equally electrically neutral atoms have a mutual attraction electrons are shared unequally
The concentration of grain alcohol (C2H5OH) in whisky is given in "degrees proof", which is twice the percent alcohol by volume (v/v). What are the mole fraction and molality of C2H5OH in 95°proof vodka? Assume that vodka is a solution of only C2H5OH and water and that the volumes are additive. The density of C2H5OH is 0.79 g/mL.
The mole fraction and molality of alcohol, C₂H₅OH, in 85°proof vodka is 0.186 and 12.70 mol/kg respectively.
How to calculate thisData provided:
Molality = moles of solute/kilogram of solvent
Mole fraction = number of moles of solute/ total number of moles
Density = mass/volume
number of moles = mass/molar mass
molar mass alcohol, C₂H₅OH = 46 g/mol
molar mass of water = 18 g/mol
density of water = 1 g/mL
the density of alcohol = 0.79 g/mL
Calculating moles of solute
85° proof vodka = 1/2 * 85% v/v
85° proof vodka = 42.5 % alcohol
In 100 mL vodka:
Volume of alcohol = 42.5 mL
volume of water = 57.5 mL
mass of alcohol, C₂H₅OH = density * volume
mass of alcohol, C₂H₅OH = 0.79 * 42.5
mass of alcohol, C₂H₅OH = 33.575 g
moles of alcohol = 33.575 g / 46 g/mol
moles of alcohol = 0.730 moles
Calculating mole fraction
mass of water = 57.5 ml * 1 g/mLmass of water = 57.5 gmoles of water = 57.5 g/ 18 g/mLmoles of water = 3.194 molesTotal moles = 3.194 + 0.730
Total moles = 3.924 moles
Mole fraction of alcohol = 0.730/3.924
Mole fraction of alcohol = 0.186
Calculating the molality of alcohol
mass of solvent = 57.5 = 0.0575 kgMolality of alcohol = 0.730 / 0.0575Molality of alcohol = 12.70 mol/kgTherefore, the mole fraction and molality of alcohol, C₂H₅OH, in 85°proof vodka is 0.186 and 12.70 mol/kg respectively.
Read more about mole fraction here:
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