Question 1

For the reaction,A(g)+ 2 B(g)⇌ 2 C(g),Kc = 1 × 10-10 at 25°C.Which of the following statements is true?

Accepted Answer

A) Δn = +1 
B) The concentration of the products is greater than the concentration of the reactants. 
C) The reaction is favored in the reverse direction. 
D) The value of Kp will be larger than the value for Kc. 
A) Δn = +1 
B) The concentration of the products is greater than the concentration of the reactants. 
C) The reaction is favored in the reverse direction. 
D) The value of Kp will be larger than the value for Kc.

Question 2

The decomposition of ammonia is: 2 NH3(g)⇌ N2(g)+ 3 H2(g).If the pressure of ammonia is
1)0 × 10-3 atm,and the pressures of N2 and H2 are each 0.20 atm,what is the value for Kp' at 400°C for the reverse reaction?

Accepted Answer

A) -6.2 × 10-4 
B) -1.6 × 103 
C) 6)2 × 10-4 
D) 1)6 × 103 
A) -6.2 × 10-4 
B) -1.6 × 103 
C) 6)2 × 10-4 
D) 1)6 × 103

Question 3

Ammonium carbamate can dissociate into gases at 25°C according to the reaction:
NH2COONH4(s)⇌ 2 NH3(g)+ CO2(g)
If sufficient ammonium carbamate is sealed in a flask,the total pressure will be 0.117 atm at equilibrium.What is the value of Kp at 25°C?

Accepted Answer

A) 2)37 × 10-4 
B) 2)00 × 10-4 
C) 1)60 × 10-3 
D) 3)42 × 10-1 
A) 2)37 × 10-4 
B) 2)00 × 10-4 
C) 1)60 × 10-3 
D) 3)42 × 10-1

Question 4

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10-3 s-1 and an equilibrium constant,Kc,equal to 4.18.What is the rate constant for the reverse reaction?

Accepted Answer

A) 2)39 × 10-4 s-1 
B) 4)18 × 10-3 s-1 
C) 2)39 × 102 s-1 
D) 4)18 × 103 s-1 
A) 2)39 × 10-4 s-1 
B) 4)18 × 10-3 s-1 
C) 2)39 × 102 s-1 
D) 4)18 × 103 s-1

Question 5

At 1000 K,Kp = 19.9 for the reaction Fe2O3(s)+ 3 CO(g)⇌ 2 Fe(s)+ 3 CO2(g).What is the value of Kp for the reaction 2 Fe(s)+ 3 CO2(g)⇌ Fe2O3(s)+ 3 CO(g)?

Accepted Answer

Question 6

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product?
C(s)+ 2 H2(g)⇌ CH4(g)ΔH° = -74.8 kJ

Accepted Answer

A) adding more C 
B) increasing the volume 
C) lowering the temperature 
D) raising the temperature 
A) adding more C 
B) increasing the volume 
C) lowering the temperature 
D) raising the temperature

For the reaction,A(g)+ 2 B(g)⇌ 2 C(g),K_c = 1 × 10^-10 at 25°C.Which of the following statements is true?

The decomposition of ammonia is: 2 NH₃(g)⇌ N₂(g)+ 3 H₂(g).If the pressure of ammonia is 1)0 × 10^-3 atm,and the pressures of N₂ and H₂ are each 0.20 atm,what is the value for K_p' at 400°C for the reverse reaction?

Ammonium carbamate can dissociate into gases at 25°C according to the reaction: NH₂COONH₄(s)⇌ 2 NH₃(g)+ CO₂(g) If sufficient ammonium carbamate is sealed in a flask,the total pressure will be 0.117 atm at equilibrium.What is the value of K_p at 25°C?

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10^-3 s^-1 and an equilibrium constant,K_c,equal to 4.18.What is the rate constant for the reverse reaction?

At 1000 K,K_p = 19.9 for the reaction Fe₂O₃(s)+ 3 CO(g)⇌ 2 Fe(s)+ 3 CO₂(g).What is the value of K_p for the reaction 2 Fe(s)+ 3 CO₂(g)⇌ Fe₂O₃(s)+ 3 CO(g)?

For the reaction shown below,which change in conditions made to the system at equilibrium will result in a net reaction to the right to form more product? C(s)+ 2 H₂(g)⇌ CH₄(g)ΔH° = -74.8 kJ

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Exam 13: Chemical Equilibrium