The normal boiling point of the 3.45 mol solution of KBr is 104.7384°C.
The normal boiling point of a 3.45 mol solution of KBr with a density of 1.10 g/mL can be calculated using the formula:
ΔT = Kb * molality
where ΔT is the boiling point elevation, Kb is the molal boiling point elevation constant for water (0.512°C kg/mol), and molality is the number of moles of solute per kilogram of solvent.
First, we need to calculate the mass of the solvent (water) required to dissolve 3.45 mol of KBr. The molar mass of KBr is 119 g/mol, so 3.45 mol of KBr would weigh 409.55 g.
Since the density of the solution is given as 1.10 g/mL, the volume of the solution is:
V = m / ρ = 409.55 g / 1.10 g/mL = 372.32 mL
So, the mass of the water is:
mH2O = V * ρH2O = 372.32 mL * 1 g/mL = 372.32 g
The molality of the solution can be calculated as follows:
molality = moles of solute / mass of solvent (in kg) = 3.45 mol / 0.37232 kg = 9.27 mol/kg
Substituting the values in the formula for boiling point elevation:
ΔT = 0.512°C kg/mol * 9.27 mol/kg = 4.7384°C
The normal boiling point of pure water is 100°C, so the boiling point of the KBr solution would be:
Boiling point = 100°C + ΔT = 100°C + 4.7384°C = 104.7384°C
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Potassium (K) and copper (Cu) are both in period 4. They both have _____.
four electron shells
similar properties
the same number of electrons
the same number of protons
Answer:
Similar properties
Explanation:
Potassium (K) has atomic number 19 which means its electron configuration (pattern of electrons in it's energy levels (electron shells)) is 2·8·8·1 while Copper (Cu) has atomic number 29 which means its electron configuration is 2·8·8·8·3 hence Potassium has 4 electron shells while Copper has 5
Potassium has 19 protons (from its atomic number) while Copper has 29 protons
The number of protons and electrons is usually the same (in an atom) (that's why atoms don't naturally have charges i.e they're usually neutral) so Potassium has about 19 electrons while Copper has about 29 electrons.
So similar properties automatically becomes your answer cuz the rest are wrong.
A website will be most accessible if all of its content can be accessed with:
A. a mouse.
B. no headers.
C.a tab key.
D..a touch screen.
Answer:a mouse
Explanation:
Answer: a mouse
Explanation:
Select the correct answer.
Which statement best describes how chemical equations demonstrate conservation of mass?
A.
The number of reactants is the same as the number of products.
B.
The compounds are the same on each side of the reaction.
C.
The number of atoms of each element is the same on each side of the equation.
D.
The state of matter is the same on each side of the equation.
Answer:
All of the Above
A.The number of reactants is the same as the number of products.
B.The compounds are the same on each side of the reaction.
C.The number of atoms of each element is the same on each side of the equation.
D.The state of matter is the same on each side of the equation.
Explanation:
Answer:
C
Explanation:
I did the test
Topic: Mass Balance. A company sells fishmeal to be used as a protein supplement in certain foods. The process consists of: a. Extraction of fish oil, stage in which a pasta is obtained that has 20% flour and 80% water. b. Drying of pasta in a rotary drum, which produces fishmeal with 40% humidity. How much pasta must be input to the process to produce 1000 kg ?
To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:
A. Extraction of fish oil:
The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.
Mass of flour = 20% of P = 0.2P kg
Mass of water = 80% of P = 0.8P kg
b. Drying of pasta:
During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.
Let's assume the mass of the dried fishmeal is M kg.
Mass of dry matter = 60% of M = 0.6M kg
Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:
0.6M kg = 0.2P kg
To produce 1000 kg of fishmeal, we want to find the corresponding value of P:
0.6M = 0.2P
P = (0.6M) / 0.2
P = 3M
Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.
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Calculate the solubility of barium carbonate, baco3, in pure water. ksp = 2.0 x 10-9
a) 3 x 10-3 m
b) 3.2 x 10-5 m
c) 2.0 x 10-5 m
d) 4.5 x 10-5 m
The solubility of barium carbonate, BaCo₃ is 4.5 x 10⁻⁵ M.
To find the solubility, the given values are,
Ksp = 2.0·10⁻⁹.
Here, s(BaCO₃) = ?M.
What is Solubility?In chemistry, Solubility is the ability of a substance, the solute, to form a solution with another substance, the solvent.
Formula for solubility is,
Ksp = [A^+]^a [B^-]^b
Ksp = solubility product constant
A^+ = cation in an aqueous solution
B^- = anion in an aqueous solution
a, b = relative concentrations of a and b
The Chemical reaction of Barium carbonate is :
BaCO₃(s) → Ba²⁺(aq) + CO₃²⁻(aq).
s(BaCO₃) = s(Ba²⁺) =s(CO₃²⁻) = x.
Ksp = s(Ba²⁺) · s(CO₃²⁻).
Ksp = x · x.
2.0·10⁻⁹ = x².
x = √2.0·10⁻⁹
= 4.47x10⁻⁵ M.
So, The solubility of Barium carbonate is 4.5x10⁻⁵ M.
Hence, Option D is the correct answer.
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Lab Report
Ocean Currents
It’s time to complete your Lab Report. Save the lab to your computer with the correct unit number, lab name, and your name at the end of the file name (e.g., U2_ Lab_OceanCturrents_Alice_Jones.doc).
Introduction
What was the purpose of the experiment?
Type your answer here:
Answer:
The purpose of the experiment is to see how water of different temperature and salinity affect the density.
Explanation:
Temperature and salinity directly affect the density of the water. Water of low temperature is more dense than water of high temperature, BUT, (fresh)water with no salt is less dense than (sea)water with more salt, so temperature and salinity change density of water.
Answer:
Please post the answers for the other questions on my page!! I will give you brainiest!! Please :(
Explanation:
All of the following are empirical formulas EXCEPT
a) Fe(OH)3
b) Na2SO4
c) N204
d) Sn3(PO4)2
2. A 1.500 g sample of a mixture containing only Cu₂O and CuO was treated with hydrogen to produce copper metal and water. After the water evaporated, 1.2244 g of pure copper metal was recovered. What is the percentage by mass of Cu₂O in the original mixture? Balanced chemical equations are given below for the reactions involved. CuO(s) + H₂(g) → Cu(s) + H₂O(l) Cu₂O(s) + H₂(g) → 2Cu(s) + H₂O(l)
The reaction of cuprous oxide gives 2 moles of copper metal and cupric oxide gives one mole of pure copper. Then, the mass of Cu₂O is 0.71 g. Then the mass percent of the Cu₂O in the mixture is 47.3 %.
What is mass percent ?The mass percent of a compound in a mixture is the ratio of its mass to the total mass of the mixture multiplied by 100. It measures how many grams of the compound is present in 100 g of the mixture.
Given that total mass of mixture = 1.5 g
let x g be the mass of Cu₂O and 1.5 -x be the mass of CuO.
According to law of mass conservation, the number of moles of copper in the reactant mixture is equal to its number of moles in the product side.
Molar mass of Cu₂O = 143 g/mol
molar mass of CuO = 79.5g
mass of Cu = 63.5 g
Then,
2 × 2x/143 + 1.5 -x/79.5 = 1.2244 g/63.5
159 x + 214.5 -143 x = 0.0192
x = 0.71 g
Then mass percent of Cu₂O = 0.71 g/1.5 g × 100 = 47.3 %.
Therefore, the mass percent of Cu₂O in the mixture is Cu₂O.
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Describe an approach for identifying an unknown mineral with as few steps as
possible.
These charts typically guide you through a series of questions based on the physical and chemical properties of the mineral, such as color, hardness, cleavage, and reaction to acid.
By answering each question, you can narrow down the possibilities and eventually identify the mineral. Another helpful tool is a handheld mineral identification kit, which includes common minerals and their properties for comparison to the unknown mineral. Observe the physical properties of the mineral, such as color, luster, hardness, cleavage, and fracture, using a magnifying glass or a microscope.
Test the mineral's hardness using a mineral hardness scale, such as Mohs scale, which ranks minerals based on their ability to scratch one another.Test the mineral's streak, which is the color of the powdered mineral, by rubbing the mineral against an unglazed porcelain plate.
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Brian Gold heated 4.996 g of sodium carbonate/sodium bicarbonate mixture to a constant mass of 4.842 g, Determine the % weight of sodium carbonate in the original mixture.
4.996 g of a sodium carbonate/sodium bicarbonate combination were cooked by Brian Gold to a constant mass of 4.842 g, In the original mixture, sodium carbonate made up roughly 3.08% of the weight.
To determine the weight percent of sodium carbonate in the original mixture, we need to calculate the mass of sodium carbonate and divide it by the initial mass of the mixture, then multiply by 100%.
Given:
Mass of the mixture before heating = 4.996 g
Mass of the mixture after heating to constant mass = 4.842 g
Let's assume the mass of sodium carbonate in the mixture is x grams.
The mass of sodium bicarbonate in the mixture can be calculated as the difference between the initial mass and the mass of sodium carbonate:
Mass of sodium bicarbonate = (4.996 g - x g)
Since sodium carbonate contains one sodium atom, one carbon atom, and three oxygen atoms, its molar mass is:
Na₂CO₃ = (2 x 22.99 g/mol) + 12.01 g/mol + (3 x 16.00 g/mol) = 105.99 g/mol
The molar mass of sodium bicarbonate (NaHCO₃) is:
Na₂CO3 = (2 x 22.99 g/mol) + 12.01 g/mol + (3 x 16.00 g/mol) = 105.99 g/mol
Using the law of conservation of mass, we can set up the equation:
(x g) + (4.996 g - x g) = 4.842 g
Simplifying the equation:
4.996 g = 4.842 g + x g - x g
0.154 g = x g
Now we can calculate the weight percent of sodium carbonate in the original mixture:
\(\% \text{weight of sodium carbonate} = \left( \frac{\text{mass of sodium carbonate}}{\text{initial mass of mixture}} \right) \times 100\%\)
\(\% \text{weight of sodium carbonate} = \left( \frac{0.154 \, \text{g}}{4.996 \, \text{g}} \right) \times 100\%\)
% weight of sodium carbonate ≈ 3.08%
Therefore, the approximate weight percent of sodium carbonate in the original mixture is 3.08%.
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- Why do we learn the Bohr Model?
Answer:
The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons. The Bohr model is simpler and relatively easy to understand. So,we learn the Bohr Model.
What is the benefit of hormones being carried by the blood? Help asap pls
Cis- and trans-2-butene can both be hydrogenated to butane; thus their energies can be compared. the _____-isomer releases less energy upon hydrogenation therefore _____-2-butene higher in energy.
Cis- and trans-2-butene can both be hydrogenated to butane; thus their energies can be compared. the trans isomer releases less energy upon hydrogenation therefore cis-2-butene higher in energy.
What is hydrogenation?The process of addition of hydrogen atom to another compound in the presence of catalyst such as nickel, cobalt etc. is termed as hydrogenation process.
Why trans has lesser energy of hydrogenation?As in trans- isomer, similar atoms or group of atoms are on opposite side. Due to which there is less repulsion between the atoms which results in more stability of trans isomer. On the other hand in cis- isomer, similar atoms or group of atoms are on same side, due to which there is more repulsion between the atoms which results in less stability of cis-isomer.
Due to more stability of trans- isomer less energy is released to add hydrogen to the trans butene as compared to cis butene for the formation of butane.
Thus we concluded that the trans isomer releases less energy than cis isomer in hydrogenation process.
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Why is the sun colder in winter?
Answer:
ummm the sun isn’t colder in winter actually the sun continues to get hotter every day?
its colder in winter because were roating further away From the sun…
using standard electrode potentials, calculate δg∘ and use its value to estimate the equilibrium constant for each of the reactions at 25 ∘c. part a pb2 (aq) mg(s)→pb(s) mg2 (aq)
The equilibrium constant can be obtained using ΔG°rxn = -RT lnK.
On the basis of this, 2H+ + 2e- → H2(g) reduction.
Therefore E° = 0V
Pb2+ + 2e- ⇄ Pb(s) - 0.126
Mg2+ + 2e- ⇄ Mg(s) -2.372
For total E°cell potential,
E°cell = Ered - Eoxd
Eoxd = -Ered of the one being oxidised
E°cell = -2.372 - (-0.126) = -2.246
E°cell = -2.246 V
Thus, calculating dG:
dG = -n x F x E°cell
dG = -2*96500*(-2.246)
=433478 J/mol
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Suppose you have 100. 00 ml of a solution of a dye and transfer 2. 00 ml of the solution to a 100. 00ml volumetric flask. After adding water to the 100. 00 ml mark, you take 5. 00 ml of that solution and again dilute to 100. 00 ml. If you find the dye concentration in the final diluted sample is 0. 000158 m, what was the dye concentration in the original solution.
The dye concentration in the original solution was 0.158 M.
The dye concentration in the original solution is determined from the dilution formula as follows:
The product of concentration and volume of initial solution is equal to the product of concentration and volume of final solution .
M₁V₁ = M₂V₂
Where M₁ = initial concentration
V₁ = original volume
M₂ = final concentration
V₂ = final volume
For the final dilution:
M₁ = M₂V₂/V₁
M₁ = 0.000158 × 100/5
M₁ = 0.000316 M
For the first dilution:
M₁ = M₂V₂/V₁
M₁ = 0.00316 × 100/2
M₁ = 0.158 M
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Covert to scientific notation.
19) 0.000036920
20) 405.9
21) 2468.10121416
22) 0.0010000
Answer:
19) 3.6920 × 10⁻⁵
20) 4.059× 10²
21) 2.46810121416 × 10³
22) 1.0000× 10⁻³
Explanation:
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
For example:
0.000036920
In scientific notation = 3.6920 × 10⁻⁵
405.9
In scientific notation = 4.059× 10²
2468.10121416
In scientific notation = 2.46810121416 × 10³
0.0010000
In scientific notation = 1.0000× 10⁻³
1) How much heat is needed to
melt 5.40 grams of ice at its
melting point?
answer: heat needed=18,300
expanation
A change of matter from one form to another without changing its chemical properties ?
Options:
Physical change
Chemical change
Explanation:
A physical change does not change the chemical properties of a compound. Instead a change in state occurs, for example evaporation where a liquid becomes a gas.
Answer:
Physical change
Explanation:
A physical change is a change of matter from one form to another without a change in chemical properties.
which properties change the composition of a substance?
Answer:
the substance of the composition change the
properties.
Which are properties of ideal gases? Select all that apply.
Ideal gas particles exert attractive or repulsive forces on each other.
Ideal gas particles travel in straight lines.
Ideal gas particles have no size.
Ideal gas particles travel in curved lines.
----------------------------------------------------------
Which type of real gas would behave the most ideally?
A) a gas consisting of large, nonpolar molecules
B) a gas consisting of small, polar molecules
C) a gas consisting of large, polar molecules
D) a gas consisting of small, nonpolar molecules
Perfect gas particles move in straight lines and have no size, among other characteristics. The right answer is D) a gas made up of tiny, nonpolar molecules.
What characteristics do ideal gases have?The gas particle's volume is quite small. There are no intermolecular forces between the gas particles, which are all the same size. Newton's Laws of Motion are consistent with the random motion of the gas particles. Perfect elastic collisions occur between gas particle without any energy being lost.
What are the characteristics of ideal and real gases?The particles of a real gas have limited volumes and are attracted to one another, whereas the particles of an ideal gas are considered to have no volume and no interparticle attraction.
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How do you convert kilograms to pounds?
Answer: (1 Kilogram = 2.20462 pounds) . There are 2.2046226218 lb in 1 kilogram. To convert kilograms to pounds, multiply your figure by 2.205 for an approximate result. 1 kilogram is also equal to 2 lb and 3.27396195 oz. Working out a rough estimate in your head for converting to pounds and ounces may be tricky - remember that there are 16 ounces in a pound.
In the reaction of nitrogen gas with oxygen gas to produce nitrogen oxide, what is the effect of adding more oxygen gas to the initial reaction mixture
The Equilibrium would shift to produce more NO
The reaction is;
N₂(g) + O₂(g) ⇆ 2NO(g)
When a reaction is at equilibrium then the forward reaction rate will be equivalent to the reverse reaction rate. Additionally, the concentration of the reactants and products are the same.
Additional reactants favor the formation of more products while additional products favor the formation of more reactants.
For example, when more oxygen is added then more Nitrogen (II) oxide will be formed.
Oxygen is a reactant and when increased it favors forward reaction which leads to the formation of more NO which is the product.
What is Equilibrium reaction?Chemical equilibrium is the condition in which both reactants and products are present in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties. If the same conditions are maintained, it will be seen that 87 percent of ammonia decomposes to form nitrogen and hydrogen. Therefore, it is an example of a reversible equilibrium reaction.
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what is the most common acid added to food? a. citric acid b. malic acid c. tartaric acid d. proprionic acid
The most common acid added to food is citric acid. It is found naturally in citrus fruits such as lemons, limes, and oranges, and is used in many processed foods and beverages to enhance their flavor and provide a sour taste.
Citric acid is also commonly used as a preservative and to balance the pH of certain foods. While malic acid, tartaric acid, and propionic acid are also used in food production, citric acid is the most widely used due to its availability, versatility, and safety.
The most common acid added to food is citric acid (a). Citric acid is a weak organic acid that is naturally present in citrus fruits, such as oranges and lemons. It is often used as a flavor enhancer, and preservative, and to add a tangy taste to various food products. Some common applications of citric acid include soft drinks, fruit juices, candies, and various processed foods. Its popularity as an additive is due to its effectiveness, affordability, and its ability to blend well with other flavors.
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Help ASAP! Brainliest for best answer!
The length of a bond, between two atoms, is the distance between the two nuclei of the atoms that is the point of ________.
Covalent inclusion
Maximum Energy
Minimum Energy
Nuclear fission
yanjun m, dazhen t, hao x, yingjie q, yong l, zhang w. division of coalbed methane desorption stages and its significance. petroleum exploration and development
The article "Division of Coalbed Methane Desorption Stages and Its Significance" published in the journal Petroleum Exploration and Development discusses the different stages of desorption of coalbed methane (CBM) and their significance. The authors, Yanjun M, Dazhen T, Hao X, Yingjie Q, Yong L, and Zhang W, analyze the release of methane gas from coal seams during the extraction process.
CBM desorption occurs in several stages: adsorption desorption, diffusion desorption, and molecular desorption. These stages represent the various mechanisms through which methane is liberated from coal. Each stage has its own characteristics and plays a significant role in the overall desorption process.
Understanding the division of CBM desorption stages is crucial for optimizing CBM extraction and production. It helps in predicting the desorption rate, estimating the amount of recoverable methane, and designing efficient production strategies.
In summary, the article by Yanjun M and colleagues provides valuable insights into the different stages of CBM desorption and their importance in the field of petroleum exploration and development.
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which of the following is not a fundamental particle? up quark electron down quark proton photon
Answer:
Explanation:
Fundamental particles are the subatomic particles with no substructure. i.e, those particles not composed of other particles
Quarks are fundamental particles because they cannot be separated into further sub particles. These have different 'flavours': up, down, top, bottom, strange, and charm. Other fundamental particles are electrons, and the other leptons: muons, tauons, muon neutrinos, electron neutrinos, and tauon neutrinos.
On the other side, we have the bosons. These are responsible for carrying the four fundamental forces: strong nuclear force, weak nuclear force, electromagnetic force, and gravity (The gravity force particle - graviton - is only theoretical, has not been discovered yet). The fundamental particles responsible for carrying these forces, are:
photon (electromagnetic force carrier), gluon (strong nuclear force carrier), Z/W⁺/W⁻ bosons ( weak nuclear force carrier), Graviton (gravitational force) [THEORETICAL ONLY], along with the Higgs Boson (mass particle) [DISCOVERED 2012}.
Therefore a proton is not a fundamental particle and neither are neutrons. These are composed of groups of 3 quarks. A proton is a group of (up, up, down) quarks, and a neutron is a group of (up, down, down) quarks. These are also known as baryons.
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) a solution is prepared by adding 1.50 g of solid nacl to 50.0 ml of 0.100 m cacl2. what is the molarity of chloride ion in the final solution? assume that the volume of the final solution is 50.0 ml.
The molarity of chloride ions in the solution is 0.712 M.
What is molarity?Molarity (M) is the amount of a substance in a certain volume of solution.
Molarity is also known as the molar concentration of a solution.
For NaCl, we use the following equation to determine the number of moles:
Given mass / Molar mass = number of moles
NaCl is assumed to weigh 1.50 g.
NaCl has a molar mass of 58.5 g/mol.
Using the values in the equation above, we obtain:
NaCl moles are equal to 1.50g/58.5g/mol, or 0.0256mol.
Both sodium and chloride ions are produced in one mole of sodium chloride (NaCl).
0.0256mol = moles of chloride ions
Regarding calcium chloride:
The following equation is used to determine the number of moles for a given molarity:
Molarity of the solution is calculated as follows: moles of solute * 100 / volume of solution (in ML).
(1)
Calcium chloride solution has a molarity of 0.100 M.
50.0 mL is the solution's volume.
Equation 1 is solved with the following values: 0.100M = Moles of CaCl2 * 1000 / 50
CaCl2 moles = 0.100M x 50
Moles of CaCl2 are equal to 0.100M*50/1000, or 0.005 mol.
One mole of calcium chloride yields two moles of chloride ions in addition to one mole of calcium ions.
Chloride ion moles equal (2 x 0.005) = 0.01 moles.
Now, we use equation 1 to determine the molarity of chloride ions in the final solution:
(0.0256 + 0.01) = 0.0356 moles of chloride ions are present in total in the solution.
50.0 mL is the total amount of solution.
Equation 1 is solved for the following values:
Chloride ion molecular weight = 0.0356 * 1000 / 50.0
The solution's molarity is 0.712M.
Consequently, the solution's molarity of chloride ions is 0.712 M.
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:quilibrium:
1. Define equilibrium when the equation
Use the equation below to answer the following equilibrium questions:
H₂O (g) + CO (g) =H₂(g) + CO₂(g) + 42 KJ
2. In the reaction above, what could happen that causes the equilibrium to shift to the right?
3. In the reaction above, what could happen to cause the equilibrium to shift to the left?
4. If pressure was increased, what direction would equilibrium shift?
5. If heat was added, what direction would equilibrium shift. What would happen to the concen
6.
If CO was added, what direction would equilibrium shift. What would happen to the concent
chiometry:
the following equation to answer the questions that follow:
Equilibrium is a state in a chemical reaction where the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of reactants and products. It is represented by a double arrow (⇌) in chemical equations. In the given equation: H₂O (g) + CO (g) ⇌ H₂(g) + CO₂(g) + 42 KJ
To shift the equilibrium to the right, one or more of the following could occur:
Increasing the concentration of H₂ or CO₂
Decreasing the concentration of H₂O or CO
Increasing the pressure
Removing some of the products (H₂ and CO₂)
Decreasing the temperature
To shift the equilibrium to the left, one or more of the following could occur:
Decreasing the concentration of H₂ or CO₂
Decreasing the pressure
Increasing the temperature
If pressure is increased, the equilibrium will shift in the direction that produces fewer moles of gas. In this case, since there are fewer moles of gas on the right side of the equation (H₂ and CO₂), the equilibrium will shift to the right. If heat is added, the equilibrium will shift in the endothermic direction to absorb the additional heat. In this case, the forward reaction is endothermic (42 KJ on the right side), so the equilibrium will shift to the right to consume the added heat.
If CO is added, the equilibrium will shift to the right to consume the additional CO.The concentration of H₂O and CO₂ will increase, while the concentrations of H₂ and CO will decrease until a new equilibrium is reached.
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Calculate the average speed for an airplane that went a distance of 600 miles in
3 hours