Question 1

Express the equilibrium constant for the following reaction. 4 CH3Cl(g)+ 2 Cl2(g)⇔ 4 CH2Cl2(g)+ 2 H2(g)

Accepted Answer

A)  K =   
B)  K =   
  
C)  K =   
  
D)  K =   
E)  K =   
A)  K =   
B)  K =   
  
C)  K =   
  
D)  K =   
E)  K =

Question 2

Define Le Chatelier's Principle.

Accepted Answer

Le Chatelier's Principle state

Question 3

Cyclohexane,C6H12,undergoes a molecular rearrangement in the presence of AlCl3 to form methylcyclopentane,CH3C5H9, according to the equation: C6H12 ⇌ CH3C5H9
If Kc = 0.143 at 25°C for this reaction,find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.075 M,respectively.

Accepted Answer

A)  [C6H12] = 0.041 M, [CH3C5H9] = 0.041 M 
B)  [C6H12] = 0.159 M, [CH3C5H9] = 0.116 M 
C)  [C6H12] = 0.241 M, [CH3C5H9] = 0.034 M 
D)  [C6H12] = 0.253 M, [CH3C5H9] = 0.022 M 
A)  [C6H12] = 0.041 M, [CH3C5H9] = 0.041 M 
B)  [C6H12] = 0.159 M, [CH3C5H9] = 0.116 M 
C)  [C6H12] = 0.241 M, [CH3C5H9] = 0.034 M 
D)  [C6H12] = 0.253 M, [CH3C5H9] = 0.022 M

Question 4

Calculate P [NO]eq,if P [NOCl]eq = 0.33 atm,P [Cl2]eq = 0.50 atm,and Kp = 1.9 × 10-2. 2 NOCl(g)⇌ 2 NO(g)+ Cl2(g)

Accepted Answer

A)  1.7 atm 
B)  0.0042 atm 
C)  0.30 atm 
D)  0.064 atm 
E)  0.087 atm 
A)  1.7 atm 
B)  0.0042 atm 
C)  0.30 atm 
D)  0.064 atm 
E)  0.087 atm

Question 5

Consider the following reaction at equilibrium.What effect will reducing the pressure of the reaction mixture have on the system? Xe(g)+ 2 F2(g)⇌ XeF4(g)

Accepted Answer

A)  The reaction will shift to the left in the direction of reactants. 
B)  The equilibrium constant will increase. 
C)  No effect will be observed. 
D)  The reaction will shift to the right in the direction of products. 
E)  The equilibrium constant will decrease. 
A)  The reaction will shift to the left in the direction of reactants. 
B)  The equilibrium constant will increase. 
C)  No effect will be observed. 
D)  The reaction will shift to the right in the direction of products. 
E)  The equilibrium constant will decrease.

Question 6

Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [H2]eq = 0.14 M,[Br2]eq = 0.39 M,[HBr]eq = 1.6 M. H2(g)+ Br2(g)⇌ 2 HBr(g)

Accepted Answer

A)  2.1 × 10-2 
B)  29 
C)  47 
D)  3.4 × 10-2 
E)  8.7 × 10-2 
A)  2.1 × 10-2 
B)  29 
C)  47 
D)  3.4 × 10-2 
E)  8.7 × 10-2

Question 7

Consider the following reaction at equilibrium.What effect will decreasing the temperature have on the system? CO2(g)+ 2 H2O(l)⇌ CH4(g)+ 2 O2(g)ΔH° = +890 kJ

Accepted Answer

A)  The reaction will shift to the left in the direction of reactants. 
B)  The equilibrium constant will decrease. 
C)  The equilibrium constant will increase. 
D)  The reaction will shift to the right in the direction of products. 
E)  No effect will be observed. 
A)  The reaction will shift to the left in the direction of reactants. 
B)  The equilibrium constant will decrease. 
C)  The equilibrium constant will increase. 
D)  The reaction will shift to the right in the direction of products. 
E)  No effect will be observed.

Question 8

Which of the following statements is TRUE?

Accepted Answer

A)  Reaction quotient is the concentration of the products raised to the stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients, measured at any point in the reaction. 
B)  Reaction quotient is the concentration of the reactants raised to the stoichiometric coefficients divided by the concentration of the products raised to their stoichiometric coefficients, measured at any point in the reaction. 
C)  Reaction quotient is the concentration of the products raised to the stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients, measured at equilibrium. 
D)  Reaction quotient is the concentration of the reactants raised to the stoichiometric coefficients divided by the concentration of the products raised to their stoichiometric coefficients, measured at equilibrium. 
E)  Reaction quotient is the concentration of the products raised to the stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients, at the point both are equal. 
A)  Reaction quotient is the concentration of the products raised to the stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients, measured at any point in the reaction. 
B)  Reaction quotient is the concentration of the reactants raised to the stoichiometric coefficients divided by the concentration of the products raised to their stoichiometric coefficients, measured at any point in the reaction. 
C)  Reaction quotient is the concentration of the products raised to the stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients, measured at equilibrium. 
D)  Reaction quotient is the concentration of the reactants raised to the stoichiometric coefficients divided by the concentration of the products raised to their stoichiometric coefficients, measured at equilibrium. 
E)  Reaction quotient is the concentration of the products raised to the stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients, at the point both are equal.

Question 9

Determine the value of Kp for the following reaction if the equilibrium concentrations are as follows: P(NOCl)eq = 0.22 atm,P(NO)eq = 0.10 atm,P(Cl2)eq = 0.11 atm. 2 NOCl(g)⇌ 2 NO(g)+ Cl2(g)

Accepted Answer

A)  1.8 
B)  44 
C)  2.3 × 102 
D)  2.3 × 10-2 
E)  0.53 
A)  1.8 
B)  44 
C)  2.3 × 102 
D)  2.3 × 10-2 
E)  0.53

Question 10

The equilibrium constant is given for two of the reactions below.Determine the value of the missing equilibrium constant. A(g)+ B(g)⇌ AB(g)Kc = 0.24
AB(g)+ A(g)⇌ A2B(g)Kc = 3.8
2 A(g)+ B(g)⇌ A2B(g)Kc = ?

Accepted Answer

A)  4.0 
B)  0.91 
C)  3.6 
D)  16 
E)  0.063 
A)  4.0 
B)  0.91 
C)  3.6 
D)  16 
E)  0.063

Question 11

An equilibrium mixture of CO,O2 and CO2 at a certain temperature contains 0.0010 M CO2 and 0.0100 M O2.At this temperature,Kc equals 1.4 × 102 for the reaction: 2 CO(g)+ O2(g)⇌ 2 CO2(g).
What is the equilibrium concentration of CO?

Accepted Answer

A)  7.1 × 10-7 M 
B)  8.4 × 10-4 M 
C)  1.4 × 10-2 M 
D)  1.2 × 10-1 M 
A)  7.1 × 10-7 M 
B)  8.4 × 10-4 M 
C)  1.4 × 10-2 M 
D)  1.2 × 10-1 M

Question 12

Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [N2]eq = 1.5 M,[H2]eq = 1.1 M,[NH3]eq = 0.47 M. N2(g)+ 3 H2(g)⇌ 2 NH3(g)

Accepted Answer

A)  3.5 
B)  0.28 
C)  9.1 
D)  0.11 
E)  0.78 
A)  3.5 
B)  0.28 
C)  9.1 
D)  0.11 
E)  0.78

Question 13

Consider the following reaction at equilibrium.What effect will increasing the pressure of the reaction mixture have on the system? 2 H2S(g)+ 3 O2(g)⇌ 2 H2O(g)+ 2 SO2(g)

Accepted Answer

A)  The reaction will shift to the right in the direction of products. 
B)  No effect will be observed. 
C)  The reaction will shift to the left in the direction of reactants. 
D)  The equilibrium constant will decrease. 
E)  The equilibrium constant will increase. 
A)  The reaction will shift to the right in the direction of products. 
B)  No effect will be observed. 
C)  The reaction will shift to the left in the direction of reactants. 
D)  The equilibrium constant will decrease. 
E)  The equilibrium constant will increase.

Question 14

The equilibrium constant,Kp,equals 3.40 for the isomerization reaction: cis-2-butene ⇌ trans-2-butene.
If a flask initially contains 0.250 atm of cis-2-butene and 0.145 atm of trans-2-butene,what is the equilibrium pressure of each gas?

Accepted Answer

A)  P(cis-2-butene) = 0.0426 atm and P(trans-2-butene) = 0.145 atm 
B)  P(cis-2-butene) = 0.0471 atm and P(trans-2-butene) = 0.160 atm 
C)  P(cis-2-butene) = 0.0735 atm and P(trans-2-butene) = 0.250 atm 
D)  P(cis-2-butene) = 0.0898 atm and P(trans-2-butene) = 0.305 atm 
A)  P(cis-2-butene) = 0.0426 atm and P(trans-2-butene) = 0.145 atm 
B)  P(cis-2-butene) = 0.0471 atm and P(trans-2-butene) = 0.160 atm 
C)  P(cis-2-butene) = 0.0735 atm and P(trans-2-butene) = 0.250 atm 
D)  P(cis-2-butene) = 0.0898 atm and P(trans-2-butene) = 0.305 atm

Question 15

The equilibrium constant is given for one of the reactions below.Determine the value of the missing equilibrium constant. N2O4(g)⇌ 2 NO2(g)Kc = 1.46
3 N2O4(g)⇌ 6 NO2(g)Kc = ?

Accepted Answer

A)  1.46 
B)  0.322 
C)  3.11 
D)  1.13 
E)  5.40 
A)  1.46 
B)  0.322 
C)  3.11 
D)  1.13 
E)  5.40

Question 16

The reaction below has a Kp value of 41.What is the value of Kc for this reaction at 400 K? N2(g)+ 3 H2(g)⇌ 2 NH3(g)

Accepted Answer

A)  3.8 × 10-2 
B)  4.4 × 104 
C)  26 
D)  2.3 × 10-5 
E)  41 
A)  3.8 × 10-2 
B)  4.4 × 104 
C)  26 
D)  2.3 × 10-5 
E)  41

Question 17

Explain dynamic equilibrium.Use the generic reaction A(g)⇌ B(g)to explain.

Accepted Answer

In this reaction,dynamic equilibrium mea

Question 18

The equilibrium constant is given for one of the reactions below.Determine the value of the missing equilibrium constant. 2 SO2(g)+ O2(g)⇌ 2 SO3(g)Kc = 1.7 × 106
SO3(g)⇌ 1/2 O2(g)+ SO2(g)Kc = ?

Accepted Answer

A)  3.4 × 102 
B)  8.5 
C)  1.3 × 103 
D)  1.2 × 10-6 
E)  7.7 × 10-4 
A)  3.4 × 102 
B)  8.5 
C)  1.3 × 103 
D)  1.2 × 10-6 
E)  7.7 × 10-4

Question 19

Express the equilibrium constant for the following reaction. 2 P4(s)+ 10 O2(g)⇌ 2 P4O10(s)

Accepted Answer

A)  K =   
B)  K =   
C)  K =   
D)  K = [O2]10 
E)  K =   
A)  K =   
B)  K =   
C)  K =   
D)  K = [O2]10 
E)  K =

Question 20

Why is an equilibrium constant unitless?

Accepted Answer

Each concentration or pressure for a rea

Exam 15: Chemical Equilibrium

Express the equilibrium constant for the following reaction. 4 CH3Cl(g)+ 2 Cl2(g)⇔ 4 CH2Cl2(g)+ 2 H2(g)

Define Le Chatelier's Principle.

Calculate P [NO]eq,if P [NOCl]eq = 0.33 atm,P [Cl2]eq = 0.50 atm,and Kp = 1.9 × 10-2. 2 NOCl(g)⇌ 2 NO(g)+ Cl2(g)

Consider the following reaction at equilibrium.What effect will reducing the pressure of the reaction mixture have on the system? Xe(g)+ 2 F2(g)⇌ XeF4(g)

Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [H2]eq = 0.14 M,[Br2]eq = 0.39 M,[HBr]eq = 1.6 M. H2(g)+ Br2(g)⇌ 2 HBr(g)

Consider the following reaction at equilibrium.What effect will decreasing the temperature have on the system? CO2(g)+ 2 H2O(l)⇌ CH4(g)+ 2 O2(g)ΔH° = +890 kJ

Which of the following statements is TRUE?

Determine the value of Kp for the following reaction if the equilibrium concentrations are as follows: P(NOCl)eq = 0.22 atm,P(NO)eq = 0.10 atm,P(Cl2)eq = 0.11 atm. 2 NOCl(g)⇌ 2 NO(g)+ Cl2(g)

The equilibrium constant is given for two of the reactions below.Determine the value of the missing equilibrium constant. A(g)+ B(g)⇌ AB(g)Kc = 0.24 AB(g)+ A(g)⇌ A2B(g)Kc = 3.8 2 A(g)+ B(g)⇌ A2B(g)Kc = ?

An equilibrium mixture of CO,O2 and CO2 at a certain temperature contains 0.0010 M CO2 and 0.0100 M O2.At this temperature,Kc equals 1.4 × 102 for the reaction: 2 CO(g)+ O2(g)⇌ 2 CO2(g). What is the equilibrium concentration of CO?

Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [N2]eq = 1.5 M,[H2]eq = 1.1 M,[NH3]eq = 0.47 M. N2(g)+ 3 H2(g)⇌ 2 NH3(g)

Consider the following reaction at equilibrium.What effect will increasing the pressure of the reaction mixture have on the system? 2 H2S(g)+ 3 O2(g)⇌ 2 H2O(g)+ 2 SO2(g)

The equilibrium constant,Kp,equals 3.40 for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. If a flask initially contains 0.250 atm of cis-2-butene and 0.145 atm of trans-2-butene,what is the equilibrium pressure of each gas?

The equilibrium constant is given for one of the reactions below.Determine the value of the missing equilibrium constant. N2O4(g)⇌ 2 NO2(g)Kc = 1.46 3 N2O4(g)⇌ 6 NO2(g)Kc = ?

The reaction below has a Kp value of 41.What is the value of Kc for this reaction at 400 K? N2(g)+ 3 H2(g)⇌ 2 NH3(g)

Explain dynamic equilibrium.Use the generic reaction A(g)⇌ B(g)to explain.

The equilibrium constant is given for one of the reactions below.Determine the value of the missing equilibrium constant. 2 SO2(g)+ O2(g)⇌ 2 SO3(g)Kc = 1.7 × 106 SO3(g)⇌ 1/2 O2(g)+ SO2(g)Kc = ?

Express the equilibrium constant for the following reaction. 2 P4(s)+ 10 O2(g)⇌ 2 P4O10(s)

Why is an equilibrium constant unitless?

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Express the equilibrium constant for the following reaction. 4 CH₃Cl(g)+ 2 Cl₂(g)⇔ 4 CH₂Cl₂(g)+ 2 H₂(g)

Calculate P [NO]_eq,if P [NOCl]_eq = 0.33 atm,P [Cl₂]_eq = 0.50 atm,and K_p = 1.9 × 10^-2. 2 NOCl(g)⇌ 2 NO(g)+ Cl₂(g)

Consider the following reaction at equilibrium.What effect will reducing the pressure of the reaction mixture have on the system? Xe(g)+ 2 F₂(g)⇌ XeF₄(g)

Determine the value of K_c for the following reaction if the equilibrium concentrations are as follows: [H₂]_eq = 0.14 M,[Br₂]_eq = 0.39 M,[HBr]_eq = 1.6 M. H₂(g)+ Br₂(g)⇌ 2 HBr(g)

Consider the following reaction at equilibrium.What effect will decreasing the temperature have on the system? CO₂(g)+ 2 H₂O(l)⇌ CH₄(g)+ 2 O₂(g)ΔH° = +890 kJ

Determine the value of K_p for the following reaction if the equilibrium concentrations are as follows: P(NOCl)_eq = 0.22 atm,P(NO)_eq = 0.10 atm,P(Cl₂)_eq = 0.11 atm. 2 NOCl(g)⇌ 2 NO(g)+ Cl₂(g)

The equilibrium constant is given for two of the reactions below.Determine the value of the missing equilibrium constant. A(g)+ B(g)⇌ AB(g)Kc = 0.24 AB(g)+ A(g)⇌ A₂B(g)K_c = 3.8 2 A(g)+ B(g)⇌ A₂B(g)K_c = ?

An equilibrium mixture of CO,O₂ and CO₂ at a certain temperature contains 0.0010 M CO₂ and 0.0100 M O₂.At this temperature,K_c equals 1.4 × 10² for the reaction: 2 CO(g)+ O₂(g)⇌ 2 CO₂(g). What is the equilibrium concentration of CO?

Determine the value of K_c for the following reaction if the equilibrium concentrations are as follows: [N₂]_eq = 1.5 M,[H₂]_eq = 1.1 M,[NH₃]_eq = 0.47 M. N₂(g)+ 3 H₂(g)⇌ 2 NH₃(g)

Consider the following reaction at equilibrium.What effect will increasing the pressure of the reaction mixture have on the system? 2 H₂S(g)+ 3 O₂(g)⇌ 2 H₂O(g)+ 2 SO₂(g)

The equilibrium constant,K_p,equals 3.40 for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. If a flask initially contains 0.250 atm of cis-2-butene and 0.145 atm of trans-2-butene,what is the equilibrium pressure of each gas?

The equilibrium constant is given for one of the reactions below.Determine the value of the missing equilibrium constant. N₂O₄(g)⇌ 2 NO₂(g)K_c = 1.46 3 N₂O₄(g)⇌ 6 NO₂(g)K_c = ?

The reaction below has a K_p value of 41.What is the value of K_c for this reaction at 400 K? N₂(g)+ 3 H₂(g)⇌ 2 NH₃(g)

The equilibrium constant is given for one of the reactions below.Determine the value of the missing equilibrium constant. 2 SO₂(g)+ O₂(g)⇌ 2 SO₃(g)K_c = 1.7 × 10⁶ SO₃(g)⇌ 1/2 O₂(g)+ SO₂(g)K_c = ?

Express the equilibrium constant for the following reaction. 2 P₄(s)+ 10 O₂(g)⇌ 2 P₄O₁₀(s)