Question 1

The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science, and is shown below.
CO2(aq)+ H2O(l) 
    
 H2CO3(aq)
Based on the equilibrium constant reported for this reaction (Kc = 1.70 × 10-3), there will be more carbon dioxide in solution than carbonic acid.

Accepted Answer

A) True 
 B)False

Question 2

Consider the chemical reaction 2NH3(g)   
N2(g)+ 3H2(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where Kc = 4.0 × 10-2.Initially, 1,220 moles of NH3(g)are present.Calculate Kp for the reaction.

Accepted Answer

Question 3

Which of these situations will result if some CH4(g) is removed from the reaction CO(g) + 3H2(g)  4(g) is removed from the reaction CO(g) + 3H2(g)      CH4(g) + H2O(g) at equilibrium? A) H2O will be consumed. B) More CH4 and H2O will be produced. C) Kp will decrease. D) More CO will be produced. E) No change will occur." class="answers-bank-image d-inline" rel="preload" >  
CH4(g) + H2O(g) at equilibrium?

Accepted Answer

A)  H2O will be consumed.
B)  More CH4 and H2O will be produced.
C)  Kp will decrease.
D)  More CO will be produced.
E)  No change will occur.F) C) and D)
G) All of the above

Question 4

Calculate Kp for the reaction 2NOCl(g)  p for the reaction 2NOCl(g)      2NO(g) + Cl2(g) at 400°C if Kc at 400°C for this reaction is 2.1 × 10-2. A) 2.1 × 10-2 B) 1.7 × 10-3 C) 0.70 D) 1.2 E) 3.8 × 10-4" class="answers-bank-image d-inline" rel="preload" >   2NO(g) + Cl2(g) at 400°C if Kc at 400°C for this reaction is 2.1 × 10-2.

Accepted Answer

A)  2.1 × 10-2
B)  1.7 × 10-3
C)  0.70
D)  1.2
E)  3.8 × 10-4F) C) and D)
G) None of the above

Question 5

The data below refer to the following reaction:
2NO(g)+ Br2(g)   
2NOBr(g)  Calculate Kc.

Accepted Answer

Question 6

For the equilibrium reaction 2SO2(g) + O2(g)     2(g) + O2(g)          2SO3(g) ,  \Delta Hºrxn = -198 kJ/mol.Which one of these factors would cause the equilibrium constant to increase? A) Decrease the temperature. B) Add SO2 gas. C) Remove O2 gas. D) Add a catalyst. E) None of these. " class="answers-bank-image d-inline" rel="preload" >  
 2SO3(g) ,  Δ\DeltaΔ Hºrxn = -198 kJ/mol.Which one of these factors would cause the equilibrium constant to increase?

Accepted Answer

A)  Decrease the temperature.
B)  Add SO2 gas.
C)  Remove O2 gas.
D)  Add a catalyst.
E)  None of these. F) None of the above
G) D) and E)

Question 7

Equilibrium is established for the reaction 2X(s) + Y(g)    2Z(g) at 500K, Kc = 100.Determine the concentration of Z in equilibrium with 0.2 mol X and 0.50 M Y at 500K. A) 3.2 M B) 3.5 M C) 4.5 M D) 7.1 M E) None of these." class="answers-bank-image d-inline" rel="preload" >   2Z(g) at 500K, Kc = 100.Determine the concentration of Z in equilibrium with 0.2 mol X and 0.50 M Y at 500K.

Accepted Answer

A)  3.2 M
B)  3.5 M
C)  4.5 M
D)  7.1 M
E)  None of these.F) B) and D)
G) All of the above

Question 8

Consider the chemical reaction 2NH3(g)   
N2(g)+ 3H2(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where Kc = 4.0 × 10-2.Initially, 1,220 moles of NH3(g)are present.Estimate the equilibrium concentration of N2(g).

Accepted Answer

Question 9

For the following reaction at equilibrium, which gives a change that will shift the position of equilibrium to favor formation of more products? 2NOBr(g)    2NO(g) + Br2(g) ,  \Delta Hºrxn = 30 kJ/mol A) Increase the total pressure by decreasing the volume. B) Add more NO. C) Remove Br2. D) Lower the temperature. E) Remove NOBr selectively. " class="answers-bank-image d-inline" rel="preload" >  
2NO(g) + Br2(g) ,  Δ\DeltaΔ Hºrxn = 30 kJ/mol

Accepted Answer

A)  Increase the total pressure by decreasing the volume.
B)  Add more NO.
C)  Remove Br2.
D)  Lower the temperature.
E)  Remove NOBr selectively. F) C) and D)
G) A) and D)

Question 10

At 250ºC, the equilibrium constant Kp for the reaction PCl5(g)  p for the reaction PCl5(g)       PCl3(g) + Cl2(g) is 1.80.Sufficient PCl5 is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl5 after the system has reached equilibrium. A) 1.50 atm B) 1.24 atm C) 4.24 atm D) 0.94 atm E) 1.12 atm" class="answers-bank-image d-inline" rel="preload" >    PCl3(g) + Cl2(g) is 1.80.Sufficient PCl5 is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl5 after the system has reached equilibrium.

Accepted Answer

A)  1.50 atm
B)  1.24 atm
C)  4.24 atm
D)  0.94 atm
E)  1.12 atmF) All of the above
G) B) and C)

Question 11

Kp for the reaction 4CuO(s)  p for the reaction 4CuO(s)      2Cu2O(s) + O2(g) is 0.49 at 1024 °C.Calculate Kc at this temperature A) 5.8 x 10-3 B) 41 C) 52 D) 4.6 x 10-3 E) 0.49" class="answers-bank-image d-inline" rel="preload" >   2Cu2O(s) + O2(g) is 0.49 at 1024 °C.Calculate Kc at this temperature

Accepted Answer

A)  5.8 x 10-3
B)  41
C)  52
D)  4.6 x 10-3
E)  0.49F) C) and D)
G) B) and E)

Question 12

A solution was prepared such that the initial concentrations of Cu2+(aq)and CN-(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation

What will be the concentration of Cu2+(aq)at equilibrium?

Accepted Answer

Question 13

Consider the equilibrium C(s)+ H2O(g)   
CO(g)+ H2(g), $\Delta$H = 2296 J.What will happen to the concentration of carbon if gaseous water is added to the system?

Accepted Answer

Question 14

When the reaction 2O3(g)   
3O2(g), for which Kp = 3.0 × 1026 at 773ºC, is at equilibrium, the mixture will contain very little O2 as compared to O3.

Accepted Answer

A) True 
 B)False

Question 15

For the reaction H2(g) + I2(g)  2(g) + I2(g)      2HI(g) , Kc = 50.2 at 445ºC.If [H2] = [I2] = [HI] = 1.75 × 10-3 M at 445ºC.Which of the following is true based on the above? A) Qc > Kc, the reaction proceeds from left to right to reach equilibrium B) Qc > Kc, the reaction proceeds from right to left to reach equilibrium C) Qc c, the reaction proceeds from left to right to reach equilibrium D) Qc c, the reaction proceeds from right to left to reach equilibrium E) Qc = Kc, the reaction is currently at equilibrium" class="answers-bank-image d-inline" rel="preload" >   2HI(g) , Kc = 50.2 at 445ºC.If [H2] = [I2] = [HI] = 1.75 × 10-3 M at 445ºC.Which of the following is true based on the above?

Accepted Answer

A)  Qc > Kc, the reaction proceeds from left to right to reach equilibrium
B)  Qc > Kc, the reaction proceeds from right to left to reach equilibrium
C)  Qc c, the reaction proceeds from left to right to reach equilibrium
D)  Qc c, the reaction proceeds from right to left to reach equilibrium
E)  Qc = Kc, the reaction is currently at equilibriumF) B) and E)
G) B) and D)

Question 16

Consider the following reactions and their associated equilibrium constants:   D + E, having equilibrium constant Kc, A) Kc = K1 + K2 B) Kc = K1/K2 C) Kc = K1  - K2 D) Kc = (K1) (K2)  E) Kc = K2/K1" class="answers-bank-image d-inline" rel="preload" >

For the reaction A + 2B   D + E, having equilibrium constant Kc, A) Kc = K1 + K2 B) Kc = K1/K2 C) Kc = K1  - K2 D) Kc = (K1) (K2)  E) Kc = K2/K1" class="answers-bank-image d-inline" rel="preload" >   D + E, having equilibrium constant Kc,

Accepted Answer

A)  Kc = K1 + K2
B)  Kc = K1/K2
C)  Kc = K1  - K2
D)  Kc = (K1) (K2) 
E)  Kc = K2/K1F) D) and E)
G) A) and D)

Question 17

Consider the reaction N2(g) + O2(g)  2(g) + O2(g)      2NO(g) , for which Kc = 0.10 at 2,000ºC.Starting with initial concentrations of 0.040 M of N2 and 0.040 M of O2, determine the equilibrium concentration of NO. A) 5.4 × 10-3 M B) 0.0096 M C) 0.013 M D) 0.080 M E) 0.10 M" class="answers-bank-image d-inline" rel="preload" >   2NO(g) , for which Kc = 0.10 at 2,000ºC.Starting with initial concentrations of 0.040 M of N2 and 0.040 M of O2, determine the equilibrium concentration of NO.

Accepted Answer

A)  5.4 × 10-3 M
B)  0.0096 M
C)  0.013 M
D)  0.080 M
E)  0.10 MF) A) and E)
G) None of the above

Question 18

The brown gas NO2 and the colorless gas N2O4 exist in equilibrium, 2NO2 2 and the colorless gas N2O4 exist in equilibrium, 2NO2     N2O4.In an experiment, 0.625 mole of N2O4 was introduced into a 5.00 L vessel and was allowed to decompose until equilibrium was reached.The concentration of N2O4 at equilibrium was 0.0750 M.Calculate Kc for the reaction. A) 7.5 B) 0.125 C) 0.0750 D) 0.10 E) 0.050" class="answers-bank-image d-inline" rel="preload" >   N2O4.In an experiment, 0.625 mole of N2O4 was introduced into a 5.00 L vessel and was allowed to decompose until equilibrium was reached.The concentration of N2O4 at equilibrium was 0.0750 M.Calculate Kc for the reaction.

Accepted Answer

A)  7.5
B)  0.125
C)  0.0750
D)  0.10
E)  0.050F) C) and D)
G) B) and C)

Question 19

For the reaction SO2(g) + NO2(g)  2(g) + NO2(g)       SO3(g) + NO(g) , the equilibrium constant is 18.0 at 1,200ºC.If 1.0 mole of SO2 and 2.0 moles of NO2 are placed in a 20.L container, what concentration of SO3 will be present at equilibrium? A) 0.48 mol/L B) 0.11 mol/L C) 0.95 mol/L D) 2.22 mol/L E) 18 mol/L" class="answers-bank-image d-inline" rel="preload" >    SO3(g) + NO(g) , the equilibrium constant is 18.0 at 1,200ºC.If 1.0 mole of SO2 and 2.0 moles of NO2 are placed in a 20.L container, what concentration of SO3 will be present at equilibrium?

Accepted Answer

A)  0.48 mol/L
B)  0.11 mol/L
C)  0.95 mol/L
D)  2.22 mol/L
E)  18 mol/LF) None of the above
G) All of the above

Question 20

For the following reaction at equilibrium in a reaction vessel, which change will cause the Br2 concentration to decrease? 2NOBr(g)  2 concentration to decrease? 2NOBr(g)      2NO(g) + Br2(g) ,  \Delta Hºrxn= 30 kJ/mol A) Increase the temperature. B) Remove some NO. C) Add more NOBr. D) Compress the gas mixture into a smaller volume. E) Add a catalyst " class="answers-bank-image d-inline" rel="preload" >  
2NO(g) + Br2(g) ,  Δ\DeltaΔ Hºrxn= 30 kJ/mol

Accepted Answer

A)  Increase the temperature.
B)  Remove some NO.
C)  Add more NOBr.
D)  Compress the gas mixture into a smaller volume.
E)  Add a catalyst F) A) and E)
G) B) and C)

Exam 14: Chemical Equilibrium

Consider the chemical reaction 2NH₃(g) N₂(g)+ 3H₂(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where K_c = 4.0 × 10^-2.Initially, 1,220 moles of NH₃(g)are present.Calculate K_p for the reaction.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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For the reaction H₂(g) + I₂(g) 2HI(g) , K_c = 50.2 at 445ºC.If [H₂] = [I₂] = [HI] = 1.75 × 10^-3 M at 445ºC.Which of the following is true based on the above?

Correct Answer
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Correct Answer
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When the reaction 2O₃(g) 3O₂(g), for which K_p = 3.0 × 10²⁶ at 773ºC, is at equilibrium, the mixture will contain very little O₂ as compared to O₃.

Correct Answer
verified

Consider the reaction N₂(g) + O₂(g) 2NO(g) , for which K_c = 0.10 at 2,000ºC.Starting with initial concentrations of 0.040 M of N₂ and 0.040 M of O₂, determine the equilibrium concentration of NO.

Correct Answer
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Consider the chemical reaction 2NH₃(g) N₂(g)+ 3H₂(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where K_c = 4.0 × 10^-2.Initially, 1,220 moles of NH₃(g)are present.Estimate the equilibrium concentration of N₂(g).

Correct Answer
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At 250ºC, the equilibrium constant K_p for the reaction PCl₅(g) PCl₃(g) + Cl₂(g) is 1.80.Sufficient PCl₅ is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl₅ after the system has reached equilibrium.

Correct Answer
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Consider the following reactions and their associated equilibrium constants: For the reaction A + 2B D + E, having equilibrium constant K_c,

Correct Answer
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Correct Answer
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K_p for the reaction 4CuO(s) 2Cu₂O(s) + O₂(g) is 0.49 at 1024 °C.Calculate K_c at this temperature

Correct Answer
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Correct Answer
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A solution was prepared such that the initial concentrations of Cu²⁺(aq)and CN^-(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation What will be the concentration of Cu²⁺(aq)at equilibrium?

Correct Answer
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For the reaction SO₂(g) + NO₂(g) SO₃(g) + NO(g) , the equilibrium constant is 18.0 at 1,200ºC.If 1.0 mole of SO₂ and 2.0 moles of NO₂ are placed in a 20.L container, what concentration of SO₃ will be present at equilibrium?

Correct Answer
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The data below refer to the following reaction: 2NO(g)+ Br₂(g) 2NOBr(g) Calculate K_c.

Correct Answer
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Which of these situations will result if some CH₄(g) is removed from the reaction CO(g) + 3H₂(g) CH₄(g) + H₂O(g) at equilibrium?

Correct Answer
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Calculate K_p for the reaction 2NOCl(g) 2NO(g) + Cl₂(g) at 400°C if K_c at 400°C for this reaction is 2.1 × 10^-2.

Correct Answer
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Equilibrium is established for the reaction 2X(s) + Y(g) 2Z(g) at 500K, K_c = 100.Determine the concentration of Z in equilibrium with 0.2 mol X and 0.50 M Y at 500K.

Correct Answer
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Exam 14: Chemical Equilibrium

Consider the chemical reaction 2NH3(g) N2(g)+ 3H2(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where Kc = 4.0 × 10-2.Initially, 1,220 moles of NH3(g)are present.Calculate Kp for the reaction.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For the following reaction at equilibrium in a reaction vessel, which change will cause the Br2 concentration to decrease? 2NOBr(g) 2NO(g) + Br2(g) , Δ\DeltaΔ Hºrxn= 30 kJ/mol

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The brown gas NO2 and the colorless gas N2O4 exist in equilibrium, 2NO2 N2O4.In an experiment, 0.625 mole of N2O4 was introduced into a 5.00 L vessel and was allowed to decompose until equilibrium was reached.The concentration of N2O4 at equilibrium was 0.0750 M.Calculate Kc for the reaction.

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For the reaction H2(g) + I2(g) 2HI(g) , Kc = 50.2 at 445ºC.If [H2] = [I2] = [HI] = 1.75 × 10-3 M at 445ºC.Which of the following is true based on the above?

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For the equilibrium reaction 2SO2(g) + O2(g) 2SO3(g) , Δ\DeltaΔ Hºrxn = -198 kJ/mol.Which one of these factors would cause the equilibrium constant to increase?

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When the reaction 2O3(g) 3O2(g), for which Kp = 3.0 × 1026 at 773ºC, is at equilibrium, the mixture will contain very little O2 as compared to O3.

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Consider the reaction N2(g) + O2(g) 2NO(g) , for which Kc = 0.10 at 2,000ºC.Starting with initial concentrations of 0.040 M of N2 and 0.040 M of O2, determine the equilibrium concentration of NO.

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Consider the chemical reaction 2NH3(g) N2(g)+ 3H2(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where Kc = 4.0 × 10-2.Initially, 1,220 moles of NH3(g)are present.Estimate the equilibrium concentration of N2(g).

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At 250ºC, the equilibrium constant Kp for the reaction PCl5(g) PCl3(g) + Cl2(g) is 1.80.Sufficient PCl5 is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl5 after the system has reached equilibrium.

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Consider the following reactions and their associated equilibrium constants: For the reaction A + 2B D + E, having equilibrium constant Kc,

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For the following reaction at equilibrium, which gives a change that will shift the position of equilibrium to favor formation of more products? 2NOBr(g) 2NO(g) + Br2(g) , Δ\DeltaΔ Hºrxn = 30 kJ/mol

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Kp for the reaction 4CuO(s) 2Cu2O(s) + O2(g) is 0.49 at 1024 °C.Calculate Kc at this temperature

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Consider the equilibrium C(s)+ H2O(g) CO(g)+ H2(g), Δ\DeltaΔ H = 2296 J.What will happen to the concentration of carbon if gaseous water is added to the system?

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A solution was prepared such that the initial concentrations of Cu2+(aq)and CN-(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation What will be the concentration of Cu2+(aq)at equilibrium?

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For the reaction SO2(g) + NO2(g) SO3(g) + NO(g) , the equilibrium constant is 18.0 at 1,200ºC.If 1.0 mole of SO2 and 2.0 moles of NO2 are placed in a 20.L container, what concentration of SO3 will be present at equilibrium?

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The data below refer to the following reaction: 2NO(g)+ Br2(g) 2NOBr(g) Calculate Kc.

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Which of these situations will result if some CH4(g) is removed from the reaction CO(g) + 3H2(g) CH4(g) + H2O(g) at equilibrium?

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Calculate Kp for the reaction 2NOCl(g) 2NO(g) + Cl2(g) at 400°C if Kc at 400°C for this reaction is 2.1 × 10-2.

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Equilibrium is established for the reaction 2X(s) + Y(g) 2Z(g) at 500K, Kc = 100.Determine the concentration of Z in equilibrium with 0.2 mol X and 0.50 M Y at 500K.

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Consider the chemical reaction 2NH₃(g) N₂(g)+ 3H₂(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where K_c = 4.0 × 10^-2.Initially, 1,220 moles of NH₃(g)are present.Calculate K_p for the reaction.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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For the reaction H₂(g) + I₂(g) 2HI(g) , K_c = 50.2 at 445ºC.If [H₂] = [I₂] = [HI] = 1.75 × 10^-3 M at 445ºC.Which of the following is true based on the above?

Correct Answer
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Correct Answer
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When the reaction 2O₃(g) 3O₂(g), for which K_p = 3.0 × 10²⁶ at 773ºC, is at equilibrium, the mixture will contain very little O₂ as compared to O₃.

Correct Answer
verified

Consider the reaction N₂(g) + O₂(g) 2NO(g) , for which K_c = 0.10 at 2,000ºC.Starting with initial concentrations of 0.040 M of N₂ and 0.040 M of O₂, determine the equilibrium concentration of NO.

Correct Answer
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Consider the chemical reaction 2NH₃(g) N₂(g)+ 3H₂(g).The equilibrium is to be established in a 1.0 L container at 1,000 K, where K_c = 4.0 × 10^-2.Initially, 1,220 moles of NH₃(g)are present.Estimate the equilibrium concentration of N₂(g).

Correct Answer
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At 250ºC, the equilibrium constant K_p for the reaction PCl₅(g) PCl₃(g) + Cl₂(g) is 1.80.Sufficient PCl₅ is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC.Calculate the pressure of PCl₅ after the system has reached equilibrium.

Correct Answer
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Consider the following reactions and their associated equilibrium constants: For the reaction A + 2B D + E, having equilibrium constant K_c,

Correct Answer
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Correct Answer
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K_p for the reaction 4CuO(s) 2Cu₂O(s) + O₂(g) is 0.49 at 1024 °C.Calculate K_c at this temperature

Correct Answer
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Correct Answer
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A solution was prepared such that the initial concentrations of Cu²⁺(aq)and CN^-(aq)were 0.0120 M and 0.0400 M, respectively.These ions react according to the following chemical equation What will be the concentration of Cu²⁺(aq)at equilibrium?

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For the reaction SO₂(g) + NO₂(g) SO₃(g) + NO(g) , the equilibrium constant is 18.0 at 1,200ºC.If 1.0 mole of SO₂ and 2.0 moles of NO₂ are placed in a 20.L container, what concentration of SO₃ will be present at equilibrium?

Correct Answer
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The data below refer to the following reaction: 2NO(g)+ Br₂(g) 2NOBr(g) Calculate K_c.

Correct Answer
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Which of these situations will result if some CH₄(g) is removed from the reaction CO(g) + 3H₂(g) CH₄(g) + H₂O(g) at equilibrium?

Correct Answer
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Calculate K_p for the reaction 2NOCl(g) 2NO(g) + Cl₂(g) at 400°C if K_c at 400°C for this reaction is 2.1 × 10^-2.

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Equilibrium is established for the reaction 2X(s) + Y(g) 2Z(g) at 500K, K_c = 100.Determine the concentration of Z in equilibrium with 0.2 mol X and 0.50 M Y at 500K.

Correct Answer
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