Question 1

The equilibrium constant, Kc , for the decomposition of COBr2  COBr2(g)  c , for the decomposition of COBr2  COBr2(g)    CO(g)  + Br2(g)  Is 0.190. What is Kc for the following reaction? 2CO(g)  + 2Br2(g)    2COBr2(g)  A)  0.0361 B)  2.63 C)  5.62 D)  10.5 E)  27.7" class="answers-bank-image d-inline" rel="preload" > CO(g)  + Br2(g) 
Is 0.190. What is Kc for the following reaction?
2CO(g)  + 2Br2(g)  c , for the decomposition of COBr2  COBr2(g)    CO(g)  + Br2(g)  Is 0.190. What is Kc for the following reaction? 2CO(g)  + 2Br2(g)    2COBr2(g)  A)  0.0361 B)  2.63 C)  5.62 D)  10.5 E)  27.7" class="answers-bank-image d-inline" rel="preload" > 2COBr2(g)

Accepted Answer

A)   0.0361
B)   2.63
C)   5.62
D)   10.5
E)   27.7F) A) and B)
G) A) and C)

Question 2

At 500°C the equilibrium constant, Kp , is 4.00 × 10-4 for the equilibrium: 2HCN(g)  p , is 4.00 × 10-4 for the equilibrium: 2HCN(g)    H2(g)  + C2N2(g)  What is Kp for the following reaction? H2(g)  + C2N2(g)    2HCN(g)  A)  2.00 × 10-4 B)  -4.00 × 10-4 C)  1.25 × 103 D)  2.50 × 103 E)  4.00 × 104" class="answers-bank-image d-inline" rel="preload" > H2(g)  + C2N2(g) 
What is Kp for the following reaction?
H2(g)  + C2N2(g)  p , is 4.00 × 10-4 for the equilibrium: 2HCN(g)    H2(g)  + C2N2(g)  What is Kp for the following reaction? H2(g)  + C2N2(g)    2HCN(g)  A)  2.00 × 10-4 B)  -4.00 × 10-4 C)  1.25 × 103 D)  2.50 × 103 E)  4.00 × 104" class="answers-bank-image d-inline" rel="preload" > 2HCN(g)

Accepted Answer

A)   2.00 × 10-4
B)   -4.00 × 10-4
C)   1.25 × 103
D)   2.50 × 103
E)   4.00 × 104F) None of the above
G) B) and E)

Question 3

At 25°C, the equilibrium constant Kc for the reaction 2A(g)  c for the reaction 2A(g)    B(g)  + C(g)  Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A? A)   B(g)  + C(g) 
Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

Accepted Answer

A)   
B)   0.339 M
C)   0.678 M
D)   6.78 M
E)   13.56 MF) D) and E)
G) B) and D)

Question 4

If all of the coefficients in the balanced equation for an equilibrium reaction are doubled, then the value of the equilibrium constant, Kc, will also be doubled.

Accepted Answer

A) True 
 B)False

Question 5

The reaction system CS2(g)  + 4H2(g)  2(g)  + 4H2(g)    CH4(g)  + 2H2S(g)  Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced? A)  As equilibrium is reestablished, the partial pressure of carbon disulfide increases. B)  As equilibrium is reestablished, the partial pressure of hydrogen decreases. C)  As equilibrium is reestablished, the partial pressure of methane, CH4, increases. D)  As equilibrium is reestablished, the partial pressures of hydrogen and hydrogen sulfide decrease. E)  As equilibrium is reestablished, all the partial pressures will increase." class="answers-bank-image d-inline" rel="preload" > CH4(g)  + 2H2S(g) 
Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

Accepted Answer

A)   As equilibrium is reestablished, the partial pressure of carbon disulfide increases.
B)   As equilibrium is reestablished, the partial pressure of hydrogen decreases.
C)   As equilibrium is reestablished, the partial pressure of methane, CH4, increases.
D)   As equilibrium is reestablished, the partial pressures of hydrogen and hydrogen sulfide decrease.
E)   As equilibrium is reestablished, all the partial pressures will increase.F) B) and E)
G) A) and D)

Question 6

Ethane can be formed by reacting acetylene with hydrogen. C2H2(g)  + 2H2(g)  2H2(g)  + 2H2(g)    C2H6(g)  H°rxn = -311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane? A)  high temperature, high pressure B)  low temperature, high pressure C)  high temperature, low pressure D)  low temperature, low pressure E)  none of the above, unless a catalyst is present" class="answers-bank-image d-inline" rel="preload" > C2H6(g)  H°rxn = -311 kJ
Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

Accepted Answer

A)   high temperature, high pressure
B)   low temperature, high pressure
C)   high temperature, low pressure
D)   low temperature, low pressure
E)   none of the above, unless a catalyst is presentF) A) and C)
G) A) and E)

Question 7

H2SO3(aq)  2SO3(aq)      HSO3-(aq)  + H+(aq)  Kc = 1.4 × 10-2 H2SO3(aq)      SO32-(aq)  + 2H+(aq)  Kc = 9.1 × 10-10 Given the above equilibrium constant data at 25 °C, what is the value of Kc at this temperature for the reaction HSO3-(aq)      SO32-(aq)  + H+(aq) ? A)  6.5 × 10-8 B)  1.3 × 10-11 C)  7.8 × 1010 D)  1.5 × 107 E)  none of the above" class="answers-bank-image d-inline" rel="preload" >   HSO3-(aq)  + H+(aq)  Kc = 1.4 × 10-2
H2SO3(aq)  2SO3(aq)      HSO3-(aq)  + H+(aq)  Kc = 1.4 × 10-2 H2SO3(aq)      SO32-(aq)  + 2H+(aq)  Kc = 9.1 × 10-10 Given the above equilibrium constant data at 25 °C, what is the value of Kc at this temperature for the reaction HSO3-(aq)      SO32-(aq)  + H+(aq) ? A)  6.5 × 10-8 B)  1.3 × 10-11 C)  7.8 × 1010 D)  1.5 × 107 E)  none of the above" class="answers-bank-image d-inline" rel="preload" >  
SO32-(aq)  + 2H+(aq)  Kc = 9.1 × 10-10
Given the above equilibrium constant data at 25 °C, what is the value of Kc at this temperature for the reaction
HSO3-(aq)  2SO3(aq)      HSO3-(aq)  + H+(aq)  Kc = 1.4 × 10-2 H2SO3(aq)      SO32-(aq)  + 2H+(aq)  Kc = 9.1 × 10-10 Given the above equilibrium constant data at 25 °C, what is the value of Kc at this temperature for the reaction HSO3-(aq)      SO32-(aq)  + H+(aq) ? A)  6.5 × 10-8 B)  1.3 × 10-11 C)  7.8 × 1010 D)  1.5 × 107 E)  none of the above" class="answers-bank-image d-inline" rel="preload" >  
SO32-(aq)  + H+(aq) ?

Accepted Answer

A)   6.5 × 10-8
B)   1.3 × 10-11
C)   7.8 × 1010
D)   1.5 × 107
E)   none of the aboveF) A) and E)
G) None of the above

Question 8

An equilibrium is established in which both the forward (fwd)  and the reverse (rev)  reactions are elementary. If the equilibrium constant Kc = 1.6 × 10-2 and the rate constant kfwd = 8.0 × 10-7 s-1 what is the value of krev?

Accepted Answer

A)   1.3 × 10-8 s-1
B)   7.8 × 107 s-1
C)   2 × 104 s-1
D)   5.0 × 10-5 s-1
E)   none of the aboveF) A) and B)
G) A) and C)

Question 9

The reaction of nitric oxide to form dinitrogen oxide and nitrogen dioxide is exothermic. 3NO(g)  2O(g)  + NO2(g)  + heat What effect will be seen if the temperature of the system at equilibrium is raised by 25°C? A)  The partial pressure of NO will increase. B)  The partial pressure of NO will decrease. C)  The partial pressure of NO2 will increase. D)  The partial pressures of NO and N2O will increase. E)  All three partial pressures will increase." class="answers-bank-image d-inline" rel="preload" > N2O(g)  + NO2(g)  + heat
What effect will be seen if the temperature of the system at equilibrium is raised by 25°C?

Accepted Answer

A)   The partial pressure of NO will increase.
B)   The partial pressure of NO will decrease.
C)   The partial pressure of NO2 will increase.
D)   The partial pressures of NO and N2O will increase.
E)   All three partial pressures will increase.F) A) and E)
G) A) and C)

Question 10

Write the mass-action expression, Qc , for the following chemical reaction. 2Cu2+(aq)  + 4I-(aq)  c , for the following chemical reaction. 2Cu2+(aq)  + 4I-(aq)    2CuI(s)  + I2(aq)  A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > 2CuI(s)  + I2(aq)

Accepted Answer

A)   c , for the following chemical reaction. 2Cu2+(aq)  + 4I-(aq)    2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   c , for the following chemical reaction. 2Cu2+(aq)  + 4I-(aq)    2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   c , for the following chemical reaction. 2Cu2+(aq)  + 4I-(aq)    2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   c , for the following chemical reaction. 2Cu2+(aq)  + 4I-(aq)    2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   c , for the following chemical reaction. 2Cu2+(aq)  + 4I-(aq)    2CuI(s)  + I2(aq)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) B) and D)
G) C) and D)

Question 11

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 E)

Question 12

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH4I(s)  4I(s)    NH3(g)  + HI(g)  At 400°C, Kp = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C. A)  0.103 atm B)  0.215 atm C)  0.232 atm D)  0.464 atm E)  2.00 atm" class="answers-bank-image d-inline" rel="preload" > NH3(g)  + HI(g) 
At 400°C, Kp = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.

Accepted Answer

A)   0.103 atm
B)   0.215 atm
C)   0.232 atm
D)   0.464 atm
E)   2.00 atmF) B) and C)
G) A) and E)

Question 13

Consider the reactions of cadmium with the thiosulfate anion. Cd2+(aq)  + S2O32-(aq)  2+(aq)  + S2O32-(aq)    Cd(S2O3) (aq)  K1 = 8.3 × 103 Cd(S2O3) (aq)  + S2O32-(aq)    Cd(S2O3) 22-(aq)  K2 = 2.5 × 102 What is the value for the equilibrium constant for the following reaction? Cd2+(aq)  + 2S2O32-(aq)    Cd(S2O3) 22-(aq)  A)  0.030 B)  33 C)  8.1 × 103 D)  8.6 × 103 E)  2.1 × 106" class="answers-bank-image d-inline" rel="preload" > Cd(S2O3) (aq)  K1 = 8.3 × 103
Cd(S2O3) (aq)  + S2O32-(aq)  2+(aq)  + S2O32-(aq)    Cd(S2O3) (aq)  K1 = 8.3 × 103 Cd(S2O3) (aq)  + S2O32-(aq)    Cd(S2O3) 22-(aq)  K2 = 2.5 × 102 What is the value for the equilibrium constant for the following reaction? Cd2+(aq)  + 2S2O32-(aq)    Cd(S2O3) 22-(aq)  A)  0.030 B)  33 C)  8.1 × 103 D)  8.6 × 103 E)  2.1 × 106" class="answers-bank-image d-inline" rel="preload" > Cd(S2O3) 22-(aq)  K2 = 2.5 × 102
What is the value for the equilibrium constant for the following reaction?
Cd2+(aq)  + 2S2O32-(aq)  2+(aq)  + S2O32-(aq)    Cd(S2O3) (aq)  K1 = 8.3 × 103 Cd(S2O3) (aq)  + S2O32-(aq)    Cd(S2O3) 22-(aq)  K2 = 2.5 × 102 What is the value for the equilibrium constant for the following reaction? Cd2+(aq)  + 2S2O32-(aq)    Cd(S2O3) 22-(aq)  A)  0.030 B)  33 C)  8.1 × 103 D)  8.6 × 103 E)  2.1 × 106" class="answers-bank-image d-inline" rel="preload" > Cd(S2O3) 22-(aq)

Accepted Answer

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

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

Write the mass-action expression, Qc , for the following chemical reaction. Sn2+(aq)  + c , for the following chemical reaction. Sn2+(aq)  +   O2(g)  + 3H2O(l)    SnO2(s)  + 2H3O+(aq)  A)    B)    C)    D)    E)  None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" > O2(g)  + 3H2O(l)  c , for the following chemical reaction. Sn2+(aq)  +   O2(g)  + 3H2O(l)    SnO2(s)  + 2H3O+(aq)  A)    B)    C)    D)    E)  None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" > SnO2(s)  + 2H3O+(aq)

Accepted Answer

A)   c , for the following chemical reaction. Sn2+(aq)  +   O2(g)  + 3H2O(l)    SnO2(s)  + 2H3O+(aq)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
B)   c , for the following chemical reaction. Sn2+(aq)  +   O2(g)  + 3H2O(l)    SnO2(s)  + 2H3O+(aq)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
C)   c , for the following chemical reaction. Sn2+(aq)  +   O2(g)  + 3H2O(l)    SnO2(s)  + 2H3O+(aq)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
D)   c , for the following chemical reaction. Sn2+(aq)  +   O2(g)  + 3H2O(l)    SnO2(s)  + 2H3O+(aq)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
E)   None of the above expressions is correct.F) A) and D)
G) None of the above

Question 16

Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO3(s)  3(s)    MgO(s)  + CO2(g)  A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C? A)  The partial pressure of carbon dioxide present at equilibrium will increase. B)  The partial pressure of carbon dioxide present at equilibrium will decrease. C)  The partial pressure of carbon dioxide at equilibrium will be unchanged. D)  The equilibrium constant will have to decrease to compensate for the decrease in volume. E)  More information is needed in order to make a valid judgment." class="answers-bank-image d-inline" rel="preload" > MgO(s)  + CO2(g) 
A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

Accepted Answer

A)   The partial pressure of carbon dioxide present at equilibrium will increase.
B)   The partial pressure of carbon dioxide present at equilibrium will decrease.
C)   The partial pressure of carbon dioxide at equilibrium will be unchanged.
D)   The equilibrium constant will have to decrease to compensate for the decrease in volume.
E)   More information is needed in order to make a valid judgment.F) C) and D)
G) B) and C)

Question 17

There is a direct correlation between the speed of a reaction and its equilibrium constant.

Accepted Answer

A) True 
 B)False

Question 18

What is the mass-action expression, Qc , for the following chemical reaction? 4H3O+(aq)  + 2Cl-(aq)  + MnO2(s)  c , for the following chemical reaction? 4H3O+(aq)  + 2Cl-(aq)  + MnO2(s)    Mn2+(aq)  + 6H2O(l)  + Cl2(g)  A)    B)    C)    D)    E)  None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" > Mn2+(aq)  + 6H2O(l)  + Cl2(g)

Accepted Answer

A)   c , for the following chemical reaction? 4H3O+(aq)  + 2Cl-(aq)  + MnO2(s)    Mn2+(aq)  + 6H2O(l)  + Cl2(g)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
B)   c , for the following chemical reaction? 4H3O+(aq)  + 2Cl-(aq)  + MnO2(s)    Mn2+(aq)  + 6H2O(l)  + Cl2(g)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
C)   c , for the following chemical reaction? 4H3O+(aq)  + 2Cl-(aq)  + MnO2(s)    Mn2+(aq)  + 6H2O(l)  + Cl2(g)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
D)   c , for the following chemical reaction? 4H3O+(aq)  + 2Cl-(aq)  + MnO2(s)    Mn2+(aq)  + 6H2O(l)  + Cl2(g)  
A)     
B)     
C)     
D)     
E)   None of the above expressions is correct." class="answers-bank-image d-inline" rel="preload" >
E)   None of the above expressions is correct.F) D) and E)
G) C) and E)

Question 19

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

Accepted Answer

K_c= [PH₃][BC...

Question 20

The equilibrium constant, Kp , for the reaction H2(g)  + I2(g)  p , for the reaction H2(g)  + I2(g)    2HI(g)  Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium? A)  Yes. B)  No, the forward reaction must proceed to establish equilibrium. C)  No, the reverse reaction must proceed to establish equilibrium. D)  Need to know the volume of the container before deciding. E)  Need to know the starting concentrations of all substances before deciding." class="answers-bank-image d-inline" rel="preload" > 2HI(g) 
Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

Accepted Answer

A)   Yes.
B)   No, the forward reaction must proceed to establish equilibrium.
C)   No, the reverse reaction must proceed to establish equilibrium.
D)   Need to know the volume of the container before deciding.
E)   Need to know the starting concentrations of all substances before deciding.F) A) and C)
G) C) and D)

Exam 17: Equilibrium: the Extent of Chemical Reactions

If all of the coefficients in the balanced equation for an equilibrium reaction are doubled, then the value of the equilibrium constant, K_c, will also be doubled.

Correct Answer
verified

At 25°C, the equilibrium constant K_c for the reaction 2A(g) B(g) + C(g) Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

Correct Answer
verified

The equilibrium constant, K_p, for the reaction H₂(g) + I₂(g) 2HI(g) Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction. Sn²⁺(aq) + O₂(g) + 3H₂O(l) SnO₂(s) + 2H₃O⁺(aq)

Correct Answer
verified

Ethane can be formed by reacting acetylene with hydrogen. C₂H₂(g) + 2H₂(g) C₂H₆(g) H°_rxn = -311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

Correct Answer
verified

The reaction of nitric oxide to form dinitrogen oxide and nitrogen dioxide is exothermic. 3NO(g) N₂O(g) + NO₂(g) + heat What effect will be seen if the temperature of the system at equilibrium is raised by 25°C?

Correct Answer
verified

There is a direct correlation between the speed of a reaction and its equilibrium constant.

Correct Answer
verified

The reaction system CS₂(g) + 4H₂(g) CH₄(g) + 2H₂S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

Correct Answer
verified

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction. 2Cu²⁺(aq) + 4I^-(aq) 2CuI(s) + I₂(aq)

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Write the expressions for K_c and K_p for the reaction PH₃BCl₃(s) PH₃(g) + BCl₃(g)

Correct Answer
verified
K_c= [PH₃][BC...
View Answer

At 500°C the equilibrium constant, K_p, is 4.00 × 10^-4 for the equilibrium: 2HCN(g) H₂(g) + C₂N₂(g) What is K_p for the following reaction? H₂(g) + C₂N₂(g) 2HCN(g)

Correct Answer
verified

An equilibrium is established in which both the forward (fwd) and the reverse (rev) reactions are elementary. If the equilibrium constant K_c = 1.6 × 10^-2 and the rate constant k_fwd = 8.0 × 10^-7s^-1 what is the value of k_rev?

Correct Answer
verified

The equilibrium constant, K_c, for the decomposition of COBr₂ COBr₂(g) CO(g) + Br₂(g) Is 0.190. What is K_c for the following reaction? 2CO(g) + 2Br₂(g) 2COBr₂(g)

Correct Answer
verified

What is the mass-action expression, Q_c , for the following chemical reaction? 4H₃O⁺(aq) + 2Cl^-(aq) + MnO₂(s) Mn²⁺(aq) + 6H₂O(l) + Cl₂(g)

Correct Answer
verified

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH₄I(s) NH₃(g) + HI(g) At 400°C, K_p = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.

Correct Answer
verified

H₂SO₃(aq) HSO₃^-(aq) + H⁺(aq) K_c = 1.4 × 10^-2 H₂SO₃(aq) SO₃^2-(aq) + 2H⁺(aq) K_c = 9.1 × 10^-10 Given the above equilibrium constant data at 25 °C, what is the value of K_c at this temperature for the reaction HSO₃^-(aq) SO₃^2-(aq) + H⁺(aq) ?

Correct Answer
verified

Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO₃(s) MgO(s) + CO₂(g) A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

Correct Answer
verified

Exam 17: Equilibrium: the Extent of Chemical Reactions

If all of the coefficients in the balanced equation for an equilibrium reaction are doubled, then the value of the equilibrium constant, Kc, will also be doubled.

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At 25°C, the equilibrium constant Kc for the reaction 2A(g) B(g) + C(g) Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

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The equilibrium constant, Kp , for the reaction H2(g) + I2(g) 2HI(g) Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

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Write the mass-action expression, Qc , for the following chemical reaction. Sn2+(aq) + O2(g) + 3H2O(l) SnO2(s) + 2H3O+(aq)

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Ethane can be formed by reacting acetylene with hydrogen. C2H2(g) + 2H2(g) C2H6(g) H°rxn = -311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

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The reaction of nitric oxide to form dinitrogen oxide and nitrogen dioxide is exothermic. 3NO(g) N2O(g) + NO2(g) + heat What effect will be seen if the temperature of the system at equilibrium is raised by 25°C?

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There is a direct correlation between the speed of a reaction and its equilibrium constant.

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The reaction system CS2(g) + 4H2(g) CH4(g) + 2H2S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

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Write the mass-action expression, Qc , for the following chemical reaction. 2Cu2+(aq) + 4I-(aq) 2CuI(s) + I2(aq)

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Consider the reactions of cadmium with the thiosulfate anion. Cd2+(aq) + S2O32-(aq) Cd(S2O3) (aq) K1 = 8.3 × 103 Cd(S2O3) (aq) + S2O32-(aq) Cd(S2O3) 22-(aq) K2 = 2.5 × 102 What is the value for the equilibrium constant for the following reaction? Cd2+(aq) + 2S2O32-(aq) Cd(S2O3) 22-(aq)

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

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

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At 500°C the equilibrium constant, Kp , is 4.00 × 10-4 for the equilibrium: 2HCN(g) H2(g) + C2N2(g) What is Kp for the following reaction? H2(g) + C2N2(g) 2HCN(g)

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An equilibrium is established in which both the forward (fwd) and the reverse (rev) reactions are elementary. If the equilibrium constant Kc = 1.6 × 10-2 and the rate constant kfwd = 8.0 × 10-7 s-1 what is the value of krev?

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The equilibrium constant, Kc , for the decomposition of COBr2 COBr2(g) CO(g) + Br2(g) Is 0.190. What is Kc for the following reaction? 2CO(g) + 2Br2(g) 2COBr2(g)

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What is the mass-action expression, Qc , for the following chemical reaction? 4H3O+(aq) + 2Cl-(aq) + MnO2(s) Mn2+(aq) + 6H2O(l) + Cl2(g)

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Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH4I(s) NH3(g) + HI(g) At 400°C, Kp = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.

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H2SO3(aq) HSO3-(aq) + H+(aq) Kc = 1.4 × 10-2 H2SO3(aq) SO32-(aq) + 2H+(aq) Kc = 9.1 × 10-10 Given the above equilibrium constant data at 25 °C, what is the value of Kc at this temperature for the reaction HSO3-(aq) SO32-(aq) + H+(aq) ?

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Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO3(s) MgO(s) + CO2(g) A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

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If all of the coefficients in the balanced equation for an equilibrium reaction are doubled, then the value of the equilibrium constant, K_c, will also be doubled.

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At 25°C, the equilibrium constant K_c for the reaction 2A(g) B(g) + C(g) Is 0.035. A mixture of 8.00 moles of B and 12.00 moles of C in a 20.0 L container is allowed to come to equilibrium. What is the equilibrium concentration of A?

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The equilibrium constant, K_p, for the reaction H₂(g) + I₂(g) 2HI(g) Is 55.2 at 425°C. A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

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Write the mass-action expression, Q_c, for the following chemical reaction. Sn²⁺(aq) + O₂(g) + 3H₂O(l) SnO₂(s) + 2H₃O⁺(aq)

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Ethane can be formed by reacting acetylene with hydrogen. C₂H₂(g) + 2H₂(g) C₂H₆(g) H°_rxn = -311 kJ Under which reaction conditions would you expect to have the greatest equilibrium yield of ethane?

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The reaction of nitric oxide to form dinitrogen oxide and nitrogen dioxide is exothermic. 3NO(g) N₂O(g) + NO₂(g) + heat What effect will be seen if the temperature of the system at equilibrium is raised by 25°C?

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The reaction system CS₂(g) + 4H₂(g) CH₄(g) + 2H₂S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

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Write the mass-action expression, Q_c, for the following chemical reaction. 2Cu²⁺(aq) + 4I^-(aq) 2CuI(s) + I₂(aq)

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

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Write the expressions for K_c and K_p for the reaction PH₃BCl₃(s) PH₃(g) + BCl₃(g)

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K_c= [PH₃][BC...
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At 500°C the equilibrium constant, K_p, is 4.00 × 10^-4 for the equilibrium: 2HCN(g) H₂(g) + C₂N₂(g) What is K_p for the following reaction? H₂(g) + C₂N₂(g) 2HCN(g)

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An equilibrium is established in which both the forward (fwd) and the reverse (rev) reactions are elementary. If the equilibrium constant K_c = 1.6 × 10^-2 and the rate constant k_fwd = 8.0 × 10^-7s^-1 what is the value of k_rev?

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The equilibrium constant, K_c, for the decomposition of COBr₂ COBr₂(g) CO(g) + Br₂(g) Is 0.190. What is K_c for the following reaction? 2CO(g) + 2Br₂(g) 2COBr₂(g)

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What is the mass-action expression, Q_c , for the following chemical reaction? 4H₃O⁺(aq) + 2Cl^-(aq) + MnO₂(s) Mn²⁺(aq) + 6H₂O(l) + Cl₂(g)

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Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH₄I(s) NH₃(g) + HI(g) At 400°C, K_p = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C.

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H₂SO₃(aq) HSO₃^-(aq) + H⁺(aq) K_c = 1.4 × 10^-2 H₂SO₃(aq) SO₃^2-(aq) + 2H⁺(aq) K_c = 9.1 × 10^-10 Given the above equilibrium constant data at 25 °C, what is the value of K_c at this temperature for the reaction HSO₃^-(aq) SO₃^2-(aq) + H⁺(aq) ?

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Magnesium carbonate dissociates to magnesium oxide and carbon dioxide at elevated temperatures. MgCO₃(s) MgO(s) + CO₂(g) A reaction vessel contains these compounds in equilibrium at 300°C. What will happen if the volume of the container is reduced by 25% at 300°C?

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