Question 1

Write the mass-action expression,Qc ,for the following chemical reaction.
MgO(s) + SO2(g) + c ,for the following chemical reaction. MgO(s) + SO2(g) +   O2(g)    MgSO4(s)  A)    B)    C)    D)    E) None of these expressions is correct." class="answers-bank-image d-inline" rel="preload" >
O2(g)  c ,for the following chemical reaction. MgO(s) + SO2(g) +   O2(g)    MgSO4(s)  A)    B)    C)    D)    E) None of these expressions is correct." class="answers-bank-image d-inline" rel="preload" >
MgSO4(s)

Accepted Answer

A)  c ,for the following chemical reaction. MgO(s) + SO2(g) +   O2(g)    MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these expressions is correct." class="answers-bank-image d-inline" rel="preload" >
B)  c ,for the following chemical reaction. MgO(s) + SO2(g) +   O2(g)    MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these expressions is correct." class="answers-bank-image d-inline" rel="preload" >
C)  c ,for the following chemical reaction. MgO(s) + SO2(g) +   O2(g)    MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these expressions is correct." class="answers-bank-image d-inline" rel="preload" >
D)  c ,for the following chemical reaction. MgO(s) + SO2(g) +   O2(g)    MgSO4(s)  
A)     
B)     
C)     
D)     
E)  None of these expressions is correct." class="answers-bank-image d-inline" rel="preload" >
E)  None of these expressions is correct.F) C) and D)
G) A) and C)

Question 2

Write the expression for Kc and Kp for the reaction
PH3BCl3(s)  
PH3(g)+ BCl3(g)

Accepted Answer

K_c = [PH₃][B...

Question 3

About half of the sodium carbonate produced is used in making glass products because it lowers the melting point of sand,the major component of glass.When sodium carbonate is added to water it hydrolyses according to the following reactions.
3? A) K1  	imes  K2 B) K1  	imes  K2. C) K1 + K2 D) K1 - K2 E) (K1K2) 2 " class="answers-bank-image d-inline" rel="preload" >
These can be combined to yield
3? A) K1  	imes  K2 B) K1  	imes  K2. C) K1 + K2 D) K1 - K2 E) (K1K2) 2 " class="answers-bank-image d-inline" rel="preload" >
What is the value of K3?

Accepted Answer

A)  K1  ×	imes×  K2
B)  K1  ×	imes×  K2.
C)  K1 + K2
D)  K1 - K2
E)  (K1K2) 2 F) C) and D)
G) A) and B)

Question 4

When 0.152 mol of solid PH3BCl3 is introduced into a 3.0 L container at a certain temperature,8.44 $\times$ 10-3 mol of PH3 is present at equilibrium:
PH3BCl3(s)  
PH3(g)+ BCl3(g)
Construct a reaction table for the process,and use it to calculate Kc at this temperature.

Accepted Answer

K_c = (0....

Question 5

The equilibrium constant,Kp,has a value of 6.5  ×	imes×  10-4 at 308 K for the reaction of nitrogen monoxide with chlorine.
2NO(g) + Cl2(g)  p,has a value of 6.5  	imes  10-4 at 308 K for the reaction of nitrogen monoxide with chlorine. 2NO(g) + Cl2(g)    2NOCl(g)  What is the value of Kc? A) 2.5  	imes  10-7 B) 6.5  	imes  10-4 C) 1.6  	imes  10-2 D) 1.7 E) None of these choices is correct. " class="answers-bank-image d-inline" rel="preload" >
2NOCl(g) 
What is the value of Kc?

Accepted Answer

A)  2.5  ×	imes×  10-7
B)  6.5  ×	imes×  10-4
C)  1.6  ×	imes×  10-2
D)  1.7
E)  None of these choices is correct. F) C) and D)
G) B) and C)

Question 6

At 850°C,the equilibrium constant Kp for the reaction
C(s) + CO2(g)  p for the reaction C(s) + CO2(g)    2CO(g)  Has a value of 10.7.If the total pressure in the system at equilibrium is 1.000 atm,what is the partial pressure of carbon monoxide? A) 0.362 atm B) 0.489 atm C) 0.667 atm D) 0.915 atm E) 0.921 atm" class="answers-bank-image d-inline" rel="preload" >
2CO(g) 
Has a value of 10.7.If the total pressure in the system at equilibrium is 1.000 atm,what is the partial pressure of carbon monoxide?

Accepted Answer

A)  0.362 atm
B)  0.489 atm
C)  0.667 atm
D)  0.915 atm
E)  0.921 atmF) A) and E)
G) A) and C)

Question 7

Sodium hydrogen carbonate decomposes above 110°C to form sodium carbonate,water,and carbon dioxide.
2NaHCO3(s)  3(s)    Na2CO3(s) + H2O(g) + CO2(g)  One thousand grams of sodium hydrogen carbonate are added to a reaction vessel,the temperature is increased to 200°C,and the system comes to equilibrium.What happens in this system if another 50 g of sodium carbonate are now added? A) The partial pressure of carbon dioxide will increase. B) The partial pressure of carbon dioxide will decrease. C) The partial pressure of carbon dioxide will be unchanged. D) The amounts of all products will be greater when equilibrium is reestablished. E) None of these conclusions is justified without knowing the equilibrium constant." class="answers-bank-image d-inline" rel="preload" >
Na2CO3(s) + H2O(g) + CO2(g) 
One thousand grams of sodium hydrogen carbonate are added to a reaction vessel,the temperature is increased to 200°C,and the system comes to equilibrium.What happens in this system if another 50 g of sodium carbonate are now added?

Accepted Answer

A)  The partial pressure of carbon dioxide will increase.
B)  The partial pressure of carbon dioxide will decrease.
C)  The partial pressure of carbon dioxide will be unchanged.
D)  The amounts of all products will be greater when equilibrium is reestablished.
E)  None of these conclusions is justified without knowing the equilibrium constant.F) B) and D)
G) A) and E)

Question 8

Although a system may be at equilibrium,the rate constants of the forward and reverse reactions will in general be different.

Accepted Answer

A) True 
 B)False

Question 9

Methanol can be synthesized by combining carbon monoxide and hydrogen.
CO(g) + 2H2(g)  2(g)    CH3OH(g)  A reaction vessel contains the three gases at equilibrium with a total pressure of 1.00 atm.What will happen to the partial pressure of hydrogen if enough argon is added to raise the total pressure to 1.4 atm? A) The partial pressure of hydrogen will decrease. B) The partial pressure of hydrogen will increase. C) The partial pressure of hydrogen will be unchanged. D) Kp needs to be known before a prediction can be made. E) Both Kp and the temperature need to be known before a prediction can be made." class="answers-bank-image d-inline" rel="preload" >
CH3OH(g) 
A reaction vessel contains the three gases at equilibrium with a total pressure of 1.00 atm.What will happen to the partial pressure of hydrogen if enough argon is added to raise the total pressure to 1.4 atm?

Accepted Answer

A)  The partial pressure of hydrogen will decrease.
B)  The partial pressure of hydrogen will increase.
C)  The partial pressure of hydrogen will be unchanged.
D)  Kp needs to be known before a prediction can be made.
E)  Both Kp and the temperature need to be known before a prediction can be made.F) B) and E)
G) C) and D)

Question 10

At 25°C,the equilibrium constant Kc for the reaction in the solvent CCl4
 2BrCl c for the reaction in the solvent CCl4  2BrCl   Br2 + Cl2  is 0.141.If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M,what is the equilibrium concentration of bromine? A) 1.35  	imes  10-3 M B) 2.70  	imes  10-3 M C) 8.82  	imes  10-3 M D) 9.70  	imes  10-2 M E) None of these choices is correct. " class="answers-bank-image d-inline" rel="preload" >
Br2 + Cl2
 is 0.141.If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M,what is the equilibrium concentration of bromine?

Accepted Answer

A)  1.35  ×	imes×  10-3 M
B)  2.70  ×	imes×  10-3 M
C)  8.82  ×	imes×  10-3 M
D)  9.70  ×	imes×  10-2 M
E)  None of these choices is correct. F) All of the above
G) A) and B)

Question 11

a.State Le Chatelier's principle
b.The following reaction is at equilibrium in a closed container:
  
What effects,if any,will the following actions have on the position of equilibrium? In each case,state the direction of any shift in equilibrium,and give your reasons in one sentence.
(i)adding more Fe(OH)3
 (ii)raising the temperature
(iii)adding a catalyst

Accepted Answer

a.If a stress is applied to a system at ...

Question 12

Ammonia is synthesized in the Haber process:
N2(g)+ 3H2(g)  
2NH3(g)
Kp for this reaction is 1.49 $\times$ 10-5 atm-2 at 500.°C.Calculate Kc at this temperature.

Accepted Answer

K_c = 6.00...

Question 13

Nitric oxide is formed in automobile exhaust when nitrogen and oxygen in air react at high temperatures.
N2(g) + O2(g)  2(g) + O2(g)    2NO(g)  The equilibrium constant Kp for the reaction is 0.0025 at 2127°C.If a container is charged with 8.00 atm of nitrogen and 5.00 atm of oxygen and the mixture is allowed to reach equilibrium,what will be the equilibrium partial pressure of nitrogen? A) 0.16 atm B) 0.31 atm C) 3.1 atm D) 7.7 atm E) 7.8 atm" class="answers-bank-image d-inline" rel="preload" >
2NO(g) 
The equilibrium constant Kp for the reaction is 0.0025 at 2127°C.If a container is charged with 8.00 atm of nitrogen and 5.00 atm of oxygen and the mixture is allowed to reach equilibrium,what will be the equilibrium partial pressure of nitrogen?

Accepted Answer

A)  0.16 atm
B)  0.31 atm
C)  3.1 atm
D)  7.7 atm
E)  7.8 atmF) A) and B)
G) A) and C)

Question 14

Which of the following has an effect on the magnitude of the equilibrium constant?

Accepted Answer

A)  activation energy of the forward reaction
B)  concentrations of the reactants and products
C)  presence of a catalyst
D)  change in volume of container
E)  change in temperatureF) None of the above
G) B) and D)

Question 15

Nitrogen dioxide decomposes according to the reaction
2NO2(g)  2(g)    2NO(g) + O2(g)  Where Kp = 4.48  	imes  10-13 at 25°C.What is the value for Kc? A) 1.81  	imes  10-16 B) 1.83  	imes  10-14 C) 4.48  	imes  10-13 D) 1.10  	imes  10-11 E) 1.11  	imes  10-9 " class="answers-bank-image d-inline" rel="preload" >
2NO(g) + O2(g) 
Where Kp = 4.48  ×	imes×  10-13 at 25°C.What is the value for Kc?

Accepted Answer

A)  1.81  ×	imes×  10-16
B)  1.83  ×	imes×  10-14
C)  4.48  ×	imes×  10-13
D)  1.10  ×	imes×  10-11
E)  1.11  ×	imes×  10-9 F) C) and D)
G) A) and D)

Question 16

For a solution equilibrium,a change in concentration of a reactant or product does not change Kc.

Accepted Answer

A) True 
 B)False

Question 17

Compounds A,B,and C react according to the following equation.
3A(g) + 2B(g)  c for this reaction? A) 0.309 B) 0.601 C) 1.66 D) 3.24 E) > 10" class="answers-bank-image d-inline" rel="preload" >
2C(g) 
At 100°C a mixture of these gases at equilibrium showed that [A] = 0.855 M,[B] = 1.23 M,and [C] = 1.75 M.What is the value of Kc for this reaction?

Accepted Answer

A)  0.309
B)  0.601
C)  1.66
D)  3.24
E)  > 10F) B) and D)
G) A) and E)

Question 18

Consider the reactions of cadmium with the thiosulfate anion.
2+(aq) + 2S2O32-(aq)    Cd(S2O3) 22-(aq)  A) 0.030 B) 33 C) 8.1  	imes  103 D) 8.6  	imes  103 E) 2.1  	imes  106 " class="answers-bank-image d-inline" rel="preload" >
What is the value for the equilibrium constant for the following reaction?
Cd2+(aq) + 2S2O32-(aq)  2+(aq) + 2S2O32-(aq)    Cd(S2O3) 22-(aq)  A) 0.030 B) 33 C) 8.1  	imes  103 D) 8.6  	imes  103 E) 2.1  	imes  106 " class="answers-bank-image d-inline" rel="preload" >
Cd(S2O3) 22-(aq)

Accepted Answer

A)  0.030
B)  33
C)  8.1  ×	imes×  103
D)  8.6  ×	imes×  103
E)  2.1  ×	imes×  106 F) B) and D)
G) A) and B)

Question 19

The following reaction is at equilibrium at a pressure of 1 atm,in a closed container.
2 gas present at equilibrium? A) adding N2 gas to double the pressure B) adding more solid NaOH C) increasing the volume of the container D) lowering the temperature E) None of these choices is correct." class="answers-bank-image d-inline" rel="preload" >
Which,if any,of the following actions will decrease the concentration of CO2 gas present at equilibrium?

Accepted Answer

A)  adding N2 gas to double the pressure
B)  adding more solid NaOH
C)  increasing the volume of the container
D)  lowering the temperature
E)  None of these choices is correct.F) A) and B)
G) A) and E)

Question 20

Hydrogen bromide will dissociate into hydrogen and bromine gases.

What effect will a temperature increase of 50°C have on this system at equilibrium?

Accepted Answer

A)  The partial pressure of hydrogen bromide will increase.
B)  The partial pressure of hydrogen will increase.
C)  The partial pressure of hydrogen bromide and bromine will increase.
D)  There will be no effect on the partial pressure of any of the gases.
E)  The initial pressure,volume and temperature must be known before any of the above predictions can be made.F) D) and E)
G) None of the above

Exam 17: Equilibrium: the Extent of Chemical Reactions

Correct Answer
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Correct Answer
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For a solution equilibrium,a change in concentration of a reactant or product does not change K_c.

Correct Answer
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Write the expression for K_c and K_p for the reaction PH₃BCl₃(s) PH₃(g)+ BCl₃(g)

Correct Answer
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K_c = [PH₃][B...
View Answer

Correct Answer
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Which of the following has an effect on the magnitude of the equilibrium constant?

Correct Answer
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At 850°C,the equilibrium constant K_p for the reaction C(s) + CO₂(g) 2CO(g) Has a value of 10.7.If the total pressure in the system at equilibrium is 1.000 atm,what is the partial pressure of carbon monoxide?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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a.If a stress is applied to a system at ...
View Answer

Correct Answer
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K_c = 6.00...
View Answer

Although a system may be at equilibrium,the rate constants of the forward and reverse reactions will in general be different.

Correct Answer
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Correct Answer
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Hydrogen bromide will dissociate into hydrogen and bromine gases. What effect will a temperature increase of 50°C have on this system at equilibrium?

Correct Answer
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Compounds A,B,and C react according to the following equation. 3A(g) + 2B(g) 2C(g) At 100°C a mixture of these gases at equilibrium showed that [A] = 0.855 M,[B] = 1.23 M,and [C] = 1.75 M.What is the value of K_c for this reaction?

Correct Answer
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Write the mass-action expression,Q_c ,for the following chemical reaction. MgO(s) + SO₂(g) + O₂(g) MgSO₄(s)

Correct Answer
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Correct Answer
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K_c = (0....
View Answer

The following reaction is at equilibrium at a pressure of 1 atm,in a closed container. Which,if any,of the following actions will decrease the concentration of CO₂ gas present at equilibrium?

Correct Answer
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Correct Answer
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Exam 17: Equilibrium: the Extent of Chemical Reactions

Correct AnswerverifiedShow Answer

Nitrogen dioxide decomposes according to the reaction 2NO2(g) 2NO(g) + O2(g) Where Kp = 4.48 ×\times× 10-13 at 25°C.What is the value for Kc?

Correct AnswerverifiedShow Answer

For a solution equilibrium,a change in concentration of a reactant or product does not change Kc.

Correct AnswerverifiedShow Answer

Write the expression for Kc and Kp for the reaction PH3BCl3(s) PH3(g)+ BCl3(g)

Correct AnswerverifiedKc = [PH3][B...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Which of the following has an effect on the magnitude of the equilibrium constant?

Correct AnswerverifiedShow Answer

At 850°C,the equilibrium constant Kp for the reaction C(s) + CO2(g) 2CO(g) Has a value of 10.7.If the total pressure in the system at equilibrium is 1.000 atm,what is the partial pressure of carbon monoxide?

Correct AnswerverifiedShow Answer

The equilibrium constant,Kp,has a value of 6.5 ×\times× 10-4 at 308 K for the reaction of nitrogen monoxide with chlorine. 2NO(g) + Cl2(g) 2NOCl(g) What is the value of Kc?

Correct AnswerverifiedShow Answer

At 25°C,the equilibrium constant Kc for the reaction in the solvent CCl4 2BrCl Br2 + Cl2 is 0.141.If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M,what is the equilibrium concentration of bromine?

Correct AnswerverifiedShow Answer

Correct Answerverifieda.If a stress is applied to a system at ...View AnswerShow Answer

Ammonia is synthesized in the Haber process: N2(g)+ 3H2(g) 2NH3(g) Kp for this reaction is 1.49 ×\times× 10-5 atm-2 at 500.°C.Calculate Kc at this temperature.

Correct AnswerverifiedKc = 6.00...View AnswerShow Answer

Although a system may be at equilibrium,the rate constants of the forward and reverse reactions will in general be different.

Correct AnswerverifiedShow Answer

About half of the sodium carbonate produced is used in making glass products because it lowers the melting point of sand,the major component of glass.When sodium carbonate is added to water it hydrolyses according to the following reactions. These can be combined to yield What is the value of K3?

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Hydrogen bromide will dissociate into hydrogen and bromine gases. What effect will a temperature increase of 50°C have on this system at equilibrium?

Correct AnswerverifiedShow Answer

Compounds A,B,and C react according to the following equation. 3A(g) + 2B(g) 2C(g) At 100°C a mixture of these gases at equilibrium showed that [A] = 0.855 M,[B] = 1.23 M,and [C] = 1.75 M.What is the value of Kc for this reaction?

Correct AnswerverifiedShow Answer

Write the mass-action expression,Qc ,for the following chemical reaction. MgO(s) + SO2(g) + O2(g) MgSO4(s)

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Consider the reactions of cadmium with the thiosulfate anion. What is the value for the equilibrium constant for the following reaction? Cd2+(aq) + 2S2O32-(aq) Cd(S2O3) 22-(aq)

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When 0.152 mol of solid PH3BCl3 is introduced into a 3.0 L container at a certain temperature,8.44 ×\times× 10-3 mol of PH3 is present at equilibrium: PH3BCl3(s) PH3(g)+ BCl3(g) Construct a reaction table for the process,and use it to calculate Kc at this temperature.

Correct Answerverified Kc = (0....View AnswerShow Answer

The following reaction is at equilibrium at a pressure of 1 atm,in a closed container. Which,if any,of the following actions will decrease the concentration of CO2 gas present at equilibrium?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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For a solution equilibrium,a change in concentration of a reactant or product does not change K_c.

Correct Answer
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Write the expression for K_c and K_p for the reaction PH₃BCl₃(s) PH₃(g)+ BCl₃(g)

Correct Answer
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K_c = [PH₃][B...
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Correct Answer
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Correct Answer
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At 850°C,the equilibrium constant K_p for the reaction C(s) + CO₂(g) 2CO(g) Has a value of 10.7.If the total pressure in the system at equilibrium is 1.000 atm,what is the partial pressure of carbon monoxide?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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a.If a stress is applied to a system at ...
View Answer

Correct Answer
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K_c = 6.00...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Compounds A,B,and C react according to the following equation. 3A(g) + 2B(g) 2C(g) At 100°C a mixture of these gases at equilibrium showed that [A] = 0.855 M,[B] = 1.23 M,and [C] = 1.75 M.What is the value of K_c for this reaction?

Correct Answer
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Write the mass-action expression,Q_c ,for the following chemical reaction. MgO(s) + SO₂(g) + O₂(g) MgSO₄(s)

Correct Answer
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Correct Answer
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Correct Answer
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K_c = (0....
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The following reaction is at equilibrium at a pressure of 1 atm,in a closed container. Which,if any,of the following actions will decrease the concentration of CO₂ gas present at equilibrium?

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Correct Answer
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