18.04g of sodium acetate must be added to 1.00L of a .200M acetic acid solution to form a buffer of 4.20.
The formula for sodium acetate (NaC2H3O2) is Na+ + C2H3O2-.
To calculate the amount of sodium acetate needed to form a buffer of 4.2, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([base]/[acid]) where [base] is the concentration of the base (sodium acetate) and [acid] is the concentration of the acid (acetic acid).
Given that the acetic acid concentration is 0.200 M,
we can solve for the concentration of sodium acetate needed to achieve a pH of 4.2 when pKa of acetic acid = 4.75 then:
4.2 = 4.75 + log([base]/0.200)
log([base]) = -0.55
[base] = 0.22 M
Now, we can calculate the amount of sodium acetate needed to achieve this concentration in 1.00 L of solution:
0.22 mol/L × 1.00 L = 0.22 mol
Then, we can convert this amount of moles to grams using the molar mass of sodium acetate.
Molar mass of sodium acetate = 82g/mole
Mass of sodium acetate required = 0.22 x 82 = 18.04g
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an unknown compound was determined to be 74.97 carbon. true or false
False. There cannot be 74.97 carbons in an unknown molecule.
What are molecules?A molecule is the smallest unit of a chemical compound and is made up of two or more atoms connected by chemical bonds. It has the chemical properties of the compound. The atoms that make up molecules might be of the same kind, as in the case of molecular oxygen (O2), or they can be of different types, as in the case of water (H2O), which is composed of hydrogen and oxygen atoms.
Chemically speaking, the statement "An unknown molecule was determined to be 74.97 carbon" makes no sense. It is impossible for a compound to consist only of carbon. Chemical analysis can be used to establish the percentage composition of the elements that make up compounds, which are composed of several elements mixed in precise ratios. A molecule might, nevertheless, have 74.97% carbon by weight if it were properly tested.
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1 kg (total mass) of a saturated mixture of liquid water and steam occupies a 10 l rigid, sealed container with a total pressure of 35 bar. what is the total internal energy (u) of the combined mixture inside this container (in kj)? use the steam tables in appendix b of your textbook.
To calculate the total internal energy of the mixture, we need to determine the amount of liquid water and steam in the container, and then calculate the internal energy of each phase using steam tables.
First, we need to find the saturation temperature at 35 bar using steam tables. This temperature is the temperature at which the pressure is 35 bar and the mixture is in a state of equilibrium, with water and steam coexisting in the container.
Next, we can use the steam tables to find the specific enthalpy of vaporization, hfg, for the saturation temperature. The specific enthalpy of vaporization is the amount of heat required to convert 1 kg of liquid water at saturation temperature to steam at saturation temperature.
Once we have hfg, we can calculate the amount of liquid water and steam in the container by using the pressure, volume, and temperature of the mixture. The total internal energy is then the sum of the internal energy of the liquid water and steam.
It's important to note that the calculations are quite involved and require a detailed understanding of thermodynamics, the properties of water and steam, and the use of steam tables. Therefore, this answer provides an overview of the process, but a complete solution would require more extensive calculations and data from steam tables.
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consult the image that depicts bowen's reaction series. what can be said of the temperature at which a granite crystallizes?
Consult the image that depicts Bowen's reaction series. Granite crystallizes at temperatures of about 750° C
According to the geological theory known as Bowen's reaction series, different minerals are created as rocks in the Earth's mantle partially melt. It bears the name Norman L. Bowen in honour of an American geologist.The premise of the series is that minerals crystallise from a magma in a specific order according to their formation temperature. The minerals are divided into felsic and mafic categories according to the Bowen's reaction series. Mafic minerals, like olivine, develop at low temperatures whereas felsic minerals, like quartz, form at the highest temperatures. Plagioclase and amphibole are examples of transitional minerals that exist between these two categories. The minerals crystallise in a predictable order when the magma's temperature drops.
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complete question:
Consult the image that depicts Bowen's reaction series. What can be said of the temperature at which a granite crystallizes?
A) Granite crystallizes at temperatures of about 750° C.
B) Granite crystallizes at temperatures of about 900° C.
C) Granite crystallizes at temperatures of about 1200° C.
D) Nothing can be deduced from this chart about the crystallization temperature of any igneous rock.
given the titration curve below, what is the equivalence volume (ml) and pka (in that order)? the titration curve has an equivalence point volume of 25.60 and ph of 7.5. the half equivalence point volume is 12.80 with a ph of 1.5. select one: 25.60, 1.5 1.5, 25.60 30, 12.70 12.70, 30
The titration curve has an equivalence point volume of 25.60 and ph of 7.5. The equivalence volume is 25.60 mL and the pKa is 1.5.
The equivalence volume is the volume of titrant added at the equivalence point, which is the point at which all of the analyte has been neutralized by the titrant and the reaction has reached completion. In this case, the equivalence volume is 25.60 mL.
The pKa is the pH at the half-equivalence point, which is the point at which half of the analyte has been neutralized by the titrant. In this case, the half-equivalence point occurs at a volume of 12.80 mL and a pH of 1.5, so the pKa is 1.5.
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The four parts, or blocks, on the periodic table are _____, _____, d, and f.
Responses
A a, ba, b
B s, p
Answer:
B. s, p
Explanation:
The four parts, or blocks, on the periodic table are s, p, d, and f.
a helpful rule for converting radians to degrees is
We multiply an angle by 180°/ to translate it from radians to degrees. We multiply an inclination by /180 to change it from degrees to radians.
A radian method is calculated.Radian Formula
Firstly, One degree equals PI/180 radians, and one unit of measure equals 180/PI degrees. Decide how many degrees you want to transform to radians by multiplying the number of degrees by PI/180 (for instance, 90 degrees = 90 x PI/180 radians = PI/2).
Why do radians differ form degrees?By how much we cocked our heads, we may measure angles in degrees. Radians use the distance covered to calculate angles. The angle (s) multiplied by radius yields an angle in trigonometric functions (theta) (r). A circular has 360 degrees, or 2 pi radians, and it takes 2 * pi * r / r to round it entirely.
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Why do you weigh the solid naoh by difference instead of directly weighing it on a weigh boat?
Since sodium hydroxide is hygroscopic and will collect water from the air, determining its mass is challenging.
In this experiment, why is the mass of the Buret section with water measured twice for each sample?To allow for possible human error, the mass of the burette segment with water should be measured twice. It is less likely that potential errors may affect experimental calculations when there are repeated measurements.
Why is measuring absorbance at its maximum wavelength best?When calculating the concentration of a colored solution, the wavelength of maximum absorbance is utilized since at this wavelength, a small change in concentration can result in a large change in the absorbance of light.
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an element has two naturally occurring isotopes. isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4 %, and isotope 2 has a mass of 122.9042 amu. part a find the atomic mass of this element. express your answer using four significant figures.
The atomic mass of the element that has two naturally occurring isotopes, isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4 %, and isotope 2 has a mass of 122.9042 amu = 121.7559
The weighted average of the atomic masses of each isotope is the atomic mass. When calculating a weighted average, each value is multiplied by a number that indicates its relative importance. In this scenario, each isotope's relative importance is indicated by its percent abundance.
The abundance of one isotope is 57.4%, while the abundance of the other is 42.6%.
100% - 57.4 % = 42.6%
Hence,
(120.9038) 0.574) + (122.9042)(0.426)
= 69.3988 + 52.3572
= 121.7559
So, the atomic mass of this element = 121.7559
The element is Sb, antimony with 121.76 atomic mass
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determine the molality of a solution of benzene dissolved in toluene (methylbenzene) for which the mole fraction of benzene is 0.451.
The molality of a solution can be calculated from the mole fraction of the solute, which is the ratio of the number of moles of solute to the total number of moles of solute and solvent.
To determine the molality of a solution of benzene dissolved in toluene, we can first convert the mole fraction to moles of benzene. The number of moles of benzene can be calculated by multiplying the mole fraction by the total number of moles of solute and solvent. Finally, the molality can be calculated by dividing the number of moles of benzene by the mass of toluene in grams. The units of molality are moles per kilogram (mol/kg). In this case, the molality of the solution would be 0.451 x total moles / mass of toluene in grams = molality (mol/kg).
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true or false. orbitals are a delocalized cloud of electron density
A delocalized cloud of electron density makes up orbitals. This assertion is accurate. resonance-based distribution of electron density outside of a fixed location, such as a single atom, lone pair, or covalent bond.
Where do delocalized electrons reside in orbitals?Atoms must be sp2 or sp hybridized and located in the same plane in order to participate in pi electron density delocalization, which is caused by overlapping 2p orbitals. Even vast numbers of these atoms can be involved in pi electron delocalization.
In the context of molecular orbital theory, are electrons localized or delocalized?As the name implies, molecular orbitals cover the entire molecule rather than being restricted to a single atom. As a result, the molecular orbital theory, also known as the molecular orbital approach, is a delocalized method of bonding.
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a unit cell contains 4 atoms of nickel at a density of 8.90 g/ml. the molar mass of nickel is 58.69 g/mol. calculate the volume of the unit cell in ml.
The volume of the unit cell in ml is 4.4*10^-23 ml.
d = (Z*M)/(V*N)
N = avocadro number
= 6.02*10^23
M = molar mass
V = volume of the unit cell
8.9 = (4*58.69)/(V*6.02*10^23)
8.9 = (3.9*10^-22)/V
V = (3.9*10^-22)/8.9
V = 4.4*10^-23 ml
Molar mass M is the mass of a chemical compound divided by using its quantity-of-substance measured in moles. Its miles are described as MB = m/nB, wherein m is the entire mass of a pattern of pure substance and nB is the amount of substance B given in moles. The definition applies to pure substance.
In chemistry, the molar mass of a chemical compound is defined because of the ratio between the mass and the amount of substance of any sample of said compound. The molar mass is a bulk, now not molecular, property of a substance. The molar mass is the median of many instances of the compound, which often varies in mass due to the presence of isotopes. maximum usually, the molar mass is computed from the standard atomic weights and is as a result a terrestrial common and a function of the relative abundance of the isotopes of the constituent atoms in the world.
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You titrate a 200 mL HBr solution with 0.5 M KOH. If it takes 150 mL of KOH to reach the equivalence point, what was the concentration of the original acid solution? a. 0.72 M b. 0.38 M c. 0.46 M d. 0.67 M
b. 0.38 M is the concentration of the original acid HBr solution.
What is the name of an acid-base titration?Acid-base titration is the word for the technique where an acid-base reaction is used. A redox titration is the method employed when a redox reaction is used. Volumetric analysis, a method for quantitative chemical analysis, seems to be another name for titration.
Concentration of HBr = C1
Volume of HBr = V1 = 200mL
Concentration of KOH = C2 = 0.5 M
Volume of KOH = V2 =150 mL
C1 x V1 = C2 x V2
C1 x 200 = 0.5 x 150
C1 = 0.38M
What does titration provide as a means of?The equivalence point, or the figure at which chemically equivalent quantities of the reactants have been integrated, is to be detected by the titration. The stoichiometry of the reaction indicates how often reactants have been integrated at the equivalence point.
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Cifras significativas de 63,000
Answer:
Cifras significativas de 63,000
Result 63000
Sig Higos 2 (63000)
Decimales 0
Notación cientifica 6.3 × 104
Notación electrónica 6.3e+4
Palabras sesenta y tres mil
Reactants called _____ bind to an enzyme's _____ site where a chemical reaction takes place.
- cofactors; metabolic
- catalysts; regulatory
- regulators; modification
- substrates; active
The reactants in a protein reaction are recognized substrates. The active site of an enzyme is where substances bind and stay on until reaction is finished and the products are liberated.
Is an action a response?An action, emotion, or behavior that is a real impact of another: When I tell people who I am, I like seeing their emotions. The government to make tax rises have received an instant, broad, and negative response.
What is an illustration of a reaction?For instance, the combination of iron (Fe) with sulfur (S) results in iron sulfide (FeS). S(s) + Fe(s) = FeS (s) The + symbol denotes an iron-sulfur reaction. The arrow denotes that the product, iron sulfide, is "formed" or "yielded" by the reaction.
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Given 1 inch equals 2.54 cm how many centimeters are in an average hand that is 9. 50 inches
Answer:
It's not that hard to do figure it out yourself
Explanation:
too simple
Explain how scientists know there are different layers of the earth
sulfur has an atomic number of 16. how many covalent bonds can sulfur form? sulfur has an atomic number of 16. how many covalent bonds can sulfur form? 0 2 1 4
Sulfur is an element in the periodic table with an atomic number of 16. It is located in the third row of the periodic table and is a non-metal. Sulfur is known for its ability to form multiple bonds with other elements, which is why it can form up to 4 covalent bonds.
This property of sulfur plays a significant role in the formation of many compounds and molecules that are crucial for life and industry. For example, sulfates and sulfides are important minerals in the earth's crust, while sulfur-containing amino acids and proteins are key components of living organisms.
Sulfur has various forms, including elemental sulfur (S8) and sulfides. Elemental sulfur is commonly found in nature as bright yellow crystals or a powder. It is abundant in the earth's crust and can be extracted from minerals such as pyrite and elemental deposits. Elemental sulfur is also produced as a by-product in oil refining and natural gas processing.
Sulfides are compounds of sulfur and other elements. For example, iron sulfide (FeS) is a mineral known as pyrite or "fool's gold." Sulfides are important minerals for the extraction of metals such as copper, lead, and zinc.
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a buffer is prepared by adding 300.0 ml of 2.0 m naoh to 500.0 ml of 2.0 m ch3cooh. what is the ph of this buffer? [ka(ch3cooh)
The pH of the buffer solution is 4.75. The pH of the buffer can be calculated using the Henderson-Hasselbalch equation. This equation states that the pH of a buffer solution is equal to the pKa of the weak acid plus the logarithm of the ratio of the concentration of the conjugate base to the weak acid. The pH can be calculated as follows:
pH = pKa + log([A-]/[HA])
where [A-] is the concentration of the conjugate base (CH3COO-) and [HA] is the concentration of the weak acid (CH3COOH). The pKa for CH3COOH is 4.75. The initial concentrations of CH3COOH and CH3COO- are equal to 2.0 M, so the pH can be calculated as follows:
pH = 4.75 + log(2.0/2.0)
pH = 4.75
So the pH of the buffer solution is 4.75.
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sylvanite is a mineral that contains 28.0 % gold by mass. how much sylvanite would you need to dig up to obtain 39.0 g of gold?
The correct answer is
You have to dig 139g of Sylvanite to obtain 39g of Gold.
The most prevalent gold telluride is sylvanite, often known as silver gold telluride, with the chemical formula (Ag,Au)Te2.The ratio of gold to silver can range from 3:1 to 1:1. It is a metallic mineral that is either steely gray or practically white in appearance. It shares a tight relationship with calaverite, a more pure form of gold telluride that contains 3% silver. The monoclinic 2/m system is the way sylvanite crystallizes. Crystals are uncommon; the typical form is bladed or granular. It has a hardness of 1.5 to 2, making it extremely soft. With a relative density of 8.2, it is dense. Because sylvanite is photosensitive, prolonged exposure to intense light can cause it to tarnish darkly.Transylvania is where sylvanite is discovered, and this is where its name is largely from. In the East Kalgoorlie area of Australia, it is also discovered and mined. It may be found in Canada in the Rouyn District, Quebec, and the Kirkland Lake Gold District, Ontario. It may be found in California and Colorado in the US, where it was extracted as a component of the Cripple Creek ore deposit. Native gold, quartz, fluorite, rhodochrosite, pyrite, acanthite, nagyagite, calaverite, krennerite, and other uncommon telluride minerals are associated with sylvanite. The deposits of low temperature hydrothermal veins are where it is most frequently found.
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when solute is added to a pure solvent what happens to the freezing point?
When solute is added to a pure solvent would make a change to the freezing point. The freezing point will decrease.
What is the Freezing Point?The temperature at which a liquid turns into a solid is known as the freezing point. If a material (solute) is added to a solvent at a specific temperature, the solute-solvent interactions prevent the solvent from transitioning into the solid phase. Therefore, the temperature must decrease further lower for the solute-solvent interactions to solidify the solution.
The example of this process is discovered when salt is applied to ice roads. Roads are salted to prevent water from freezing at the usual degree: 0°C but rather at a lower temperature: approximately 9°C. So, it is obvious that the freezing point will decrease when solute is added to a pure solvent.
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a certain pipette delivers 5.00 ml 0.05 ml. what is the percent relative uncertainty delivered by the pipette?
Answer:
The absolute error is ± 0.05 grams.The relative error (δ) of your measurement is 0.05 g/1.00 g = 0.05, or 5%.
Explanation:
if 6.805 grams of material contain 0.096 moles, calculate the molar mass. answer to three significant figures
If 6.805 grams of the material contain 0.096 moles, the molar mass of the material is 70.88 g/mol.
The mass of the material = 6.805 grams
The moles of the material = 0.096 mol
The number of moles is expressed as follows :
The number of moles = mass / molar mass
Where
The number of moles = 0.096 mol
Mass = 6.805 grams
The molar mass is expressed as :
Molar mass = mass / moles
Molar mass = 6.805 g / 0.096 mol
Molar mass = 70.88 g/mol
Thus, the molar mass of the substance is 70.88 with the mass of 6.805 g.
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a possible mechanism for the decomposition of hydrogen per- oxide is using your results from exercise 33, specify which step is the rate-determining step. what is the overall balanced equation for the reaction?
The overall balanced equation for the reaction is
2H2O2 (l) -> 2H2O (l) + O2 (g)
An equation for a chemical reaction is said to be balanced if both the reactants and the products' total charges and the number of atoms for each component are equal.
The following is the overall balanced equation for the breakdown of hydrogen peroxide:
2H2O2 (l) -> 2H2O (l) + O2 (g)
The results of exercise 33 do not contain information about the reaction's mechanism, which is necessary to determine the rate-determining step. The slowest phase in a reaction mechanism, the rate-determining step, also known as the rate-limiting step, regulates the total reaction rate. Analysis of the reaction's kinetics and experimentation are required to find the rate-determining phase.
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The ability of molecules to stick to each other is termedA. cohesion.B. solvent.C. hydrophilicD. adhesionE. hydrophobic
The ability of molecules to stick to each other is called "adhesion''. Adhesion refers to the tendency of two different substances to stick or bond to each other.
This interaction is driven by various forces such as hydrogen bonding, van der Waals forces, and ionic bonding, among others. Adhesion is an important property in many areas of science and technology, including materials science, surface chemistry, and biology. For example, adhesion plays a crucial role in the functioning of biological systems, such as in the attachment of cells to surfaces or the formation of bonds between proteins. In materials science, adhesion is used to create strong bonds between different materials, such as in the production of adhesives, coatings, and composites.
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since ammonia and water have arrangement of electron pairs, then the hybridization of the nitrogen and oxygen in both molecules is .
Since ammonia and water have tetrahedral arrangement of electron pairs, then the hybridization of the nitrogen and oxygen in both molecules is sp3
Molecule is the smallest part of a substance that still has the same properties as the substance. If the nature of the arrangement of atoms in a molecule changes, the properties of the molecule will also change. Tetrahedral is a rectangular pyramid shape that has an equilateral triangular face in which there are five atoms of this molecular shape found in ammonia and water.
Hybridization is the process of combining a central atomic orbital with other atomic orbitals to form hybrid orbitals. Such hybrid orbitals can be formed by mixing atomic orbitals that are close in energy in character. In nitrogen covalent bonds are also formed between carbon compounds and other atoms. The sigma bond is formed by overlapping the unpaired sp3 hybrid orbital with the 1s orbital of the hydrogen to give an ammonia molecule and oxygen's six valence electrons. After hybridization, it will have two half-filled sp3 orbitals and will form two bonds reflecting the mixing of the respective atomic orbitals..
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compose a list of metallic minerals and a list of non-metallic minerals that are used in and aorund your home, and describe how they are used
Minerals that do not contain metals include bauxite, hematite, iron ore, and others. Non-metallic minerals include diamond, salt, potash, and mica.
What everyday minerals are non-metallic?Some examples include sand, gravel, marble, limestone, clay, and other nonmetallic minerals. Metallic properties like luster, rigidity, good electric and thermal conductivity, and malleability are lacking in these materials; However, they are used by numerous business sectors.
Which metallic minerals are used at our facility?The most frequently used household metals are copper and aluminum. The most common household metal alloys are steel (iron, carbon, and other elements) and brass (copper and zinc).
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how many moles of naoh must be added to 1.0 l of 2.0 hc2h3o2 to produce a solution buffered at each ph
The amount of NaOH that must be added is 1.276 moles.
To calculate the pH of a buffer solution, we can use the Henderson-Hasselbalch formula:
pH = pKa + log(A⁻ / HA)
Ka is the acid dissociation constant of a weak acid (HA). The Ka for HC₂H₃O₂ or acetic acid is 1.76 * 10⁻⁵The equation for the reaction between NaOH and HC₂H₃O₂ is as follows:
NaOH (s) + HC₂H₃O₂ (aq) -> Na⁺ (aq) + C₂H₃O₂⁻ (aq) + H₂O (l)
The initial moles of HC₂H₃O₂ is 2.0 M * 1.0 L = 2.0 moles.
Plug the known values into the Henderson-Hasselbalch formula:
5 = -log (1.76 * 10⁻⁵) + log (NaOH moles / 2.0 - NaOH moles)
5 = 4.754 + log (NaOH moles / 2.0 - NaOH moles)
0.246 = log (NaOH moles / 2.0 - NaOH moles)
[tex]10^{0.246}[/tex] = log (NaOH moles / 2.0 - NaOH moles)
1.762 = log (NaOH moles / 2.0 - NaOH moles)
NaOH moles = 1.276.
Your question seems incomplete. The completed version is mostly as follows:
What quantity (moles) of NaOH must be added to 1.0 L of 2.0 M HC2H3O2 to produce a solution buffered at pH = 5?
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does this experiment show that electrons flow from the cathode to the anode, or is it possible for electrons to flow from the anode to the cathode?
J.J. Thomson's experiments with cathode ray tubes showed that electrons flow from the cathode (the negatively-charged electrode) to the anode (the positively-charged electrode).
However, this flow is not always the case, as in some cases electrons can flow from the anode to the cathode. This is due to the fact that electrons can be "pushed" by an applied electric field from the anode to the cathode.
This beam was later identified as a stream of electrons, which Thomson determined had a negative charge. He also used a paddle wheel inside the tube to measure the velocity of the electrons and found that they traveled at a constant speed. These experiments showed that electrons are fundamental particles of matter and led to the development of the modern atomic model.
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if a mixture of solid nickel(ii) oxide and 0.20 m carbon monoxide comes to equilibrium at 1500 k, what is the equilibrium concentration of ?
If a mixture of solid nickel oxide and 0.20 M carbon monoxide comes to equilibrium at 1500 k, The concentration of CO₂ at equilibrium is approximately 800 M.
This reaction is an example of heterogeneous equilibria between the substance's reactants and products in two or more phases.
Thus, Kc depends on the concentration of CO₂ and CO and the equilibrium expression is as follows:
K(c) = [CO₂] ÷ [CO] (1)
As per the reaction, 1 mol of CO gives 1 mol of CO₂.
Given, Concentration of CO = 0.20M
Given, Kc = 4.0 × 10³
At equilibrium:
Let the concentration of CO₂= x M
The concentration of CO becomes = 0.20M - x M
substituting these values in equation (1)
4.0 × 10³ = x ÷ (0.20 - x)
on solving the value of x is:
x = 800
[CO₂] = 800 M
Thus, the concentration of CO₂ at equilibrium is approximately 800 M.
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an unknown substance enters earth's atmosphere from outer space. the object is measured to have a density of 12.45 g/ml. what is the mass of a cube of this substance that measures 8.0 cm on each side?
The object is to measured to have the density of 12.45 g/ml. The mass of a cube of this substance that measures 8.0 cm on each side is 6374.4 g.
The side of the cube = 8 cm
The volume of the cube is as follows :
Volume of cube = ( side )³
Volume of cube = ( 8 cm³)
Volume of cube = 512 cm³
The density of the cube = 12.45 g/mL = 12.45 g/cm³
The density is expressed as :
The density = mass / volume
Mass = density × volume
Mass = 12.45 g/cm³ × 512 cm³
Mass = 6374.4 g
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