CHEM 1212 – QUIZ-II-1
5 March 2014
Name: ________________________________
Section: _______________________________
Instructions: This is a take home quiz that is due at the beginning of class on Friday, March 7, 2014. Show work. Do not
just give answers.
1. (3 pts) Calculate Kp for the following equilibrium reaction.
N2 (g)
+
3H2 (g)
⇌
Kc = 2.4 x 10-3
2 NH3 (g)
at 726.85 oC
ANSWER: _________________________
2. (3 pts) For the following reaction, Kp = 6.5 x 104 at 308 K. At equilibrium, PNO = 0.35 atm, PCl2 = 0.10 atm. What
is the equilibrium partial pressure of NOCl?
2NO (g)
+
Cl2 (g)
⇌
2 NOCl (g)
Partial Pressure of NOCl: _________________________
CHEM 1212 – QUIZ-II-1
5 March 2014
Name: ________________________________
Section: _______________________________
3. At a particular temperature, Kc = 0.016 for:
a. (2 pts) Calculate Kc for:
⇌
2 H2S (g)
5H2 (g)
+
5/2 S2 (g)
2H2 (g)
⇌
+
S2 (g)
5 H2S (g)
ANSWER: __________________________
b. (2 pts) Calculate Kc for:
⇌
8H2S (g)
8H2 (g)
+
4S2 (g)
ANSWER: ___________________________
4. At equilibrium, [NH3] = 0.0225 M, [N2] = 0.114 M and [H2] = 0.342 M for the reaction below. Calculate Kc.
2NH3 (g)
⇌
N2(g)
+
3H2 (g)
ANSWER: __________________________
CHEM 1212 – QUIZ-II-1
5 March 2014
Name: ________________________________
Section: _______________________________
5. (4 pts) For the reaction below, 0.4000 M of PCl5 (g) was initially introduced into a container. Calculate the
equilibrium concentrations of each of the compounds in the reaction if Kc = 28.5.
PCl5 (g)
⇌
[PCl5] = ________________
6. (3 pts) For the reaction:
PCl3 (g)
+
Cl2 (g)
[PCl3] = _________________
H2 (g)
+
I2 (g)
⇌
[Cl2 ] = _____________________
2HI(g)
Kp = 0.49 @ 730 K
If [H2] = 0.870 M, [I2] = 1.31 M and [HI] = 0.580 M, is the reaction at equilibrium? Prove below.
ANSWER? YES
or
NO
If the reaction is not at equilibrium, in which direction will the reaction process to achieve equilibrium?