Chem1212_Exam_3_B. 100% correct

Chem 1212 Exam- 3_B

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) Determine the value of Kc for the following reaction if the equilibrium concentrations are as 1)
follows: [N2]eq =1.5 M, [H2]eq =1.1 M, [NH3 ]eq =0.47 M.

N2(g) + 3 H2 (g) 2 NH3 (g)

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


2) Calculate P [NO]eq, if P [NOCl]eq =0.33 atm, P [Cl2]eq =0.50 atm, and Kp =1.9 x 10- 2. 2)

2 NOCl(g) 2 NO(g) +Cl2(g)

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

3) The equilibrium constant is given for two of the reactions below. Determine the value of the missing 3)
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) A2 B(g) Kc = ?

A) 16 B) 0.63 C) 4.0 D) 0.91 E) 3.6

4) In which of the following reactions will Kc =Kp? 4)
A) 4 NH3(g) + 3 O2 (g) 2 N2 (g) + 6 H2 O(g)
B) 2 SO2 (g) + O2(g) 2 SO3(g)
C) SO3(g) + NO(g) SO2(g) + NO2 (g)
D) 2 N2(g) + O2(g) 2 N2O(g)
E) None of the above reactions have Kc =Kp.




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, 5) Consider the following reaction and its equilibrium constant: 5)

SO2 (g) + NO2 (g) SO3 (g) + NO(g) Kc = 0.33

A reaction mixture contains 0.39 M SO2 , 0.14 M NO2 , 0.11 M SO3 and 0.14 M NO. Which of the
following statements is TRUE concerning this system?
A) The reaction will shift in the direction of products.
B) The reaction will shift in the direction of reactants.
C) The reaction quotient will decrease.
D) The equilibrium constant will decrease.
E) The system is at equilibrium.

6) Consider the following reaction: 6)

CuS(s) + O2(g) Cu(s) + SO2 (g)

A reaction mixture initially contains 2.9 M O2 . Determine the equilibrium concentration of O2 if Kc
for the reaction at this temperature is 1.5.
A) 1.9 M B) 0.59 M C) 2.2 M D) 1.2 M E) 1.7 M

7) The following reaction is exothermic. Which change will shift the equilibrium to the left? 7)
2 SO2 (g) +O2 (g) 2 SO3 (g)
A) increase volume
B) decrease pressure
C) raising the temperature
D) all of the above
E) none of the above

8) Consider the following reaction at equilibrium. What effect will decreasing the temperature have on the
8)
system?

CO 2 (g) + 2 H2 O(l) CH4 (g) + 2 O2 (g) H° = +890 kJ

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

9) Consider the following reaction at equilibrium. What effect will increasing the pressure of the reaction
9)
mixture have on the system?

CuS(s) + O2 (g) Cu(s) + SO2 (g)

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



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