# Practice Quiz 1A Answer Key - 1 NAME CHM 2046 Quiz 1A...

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K p = 11.3 K c = 144 K = 0.083 m equilibriu at not K Q 333 (1.2) (0.12) (2.4) p(O ) p(SO ) p(SO Q p p 2 2 2 2 2 2 3 p = = = ) Q p > K p reaction proceeding to the left. Δ n = -1 therefore 11.3 0) (0.082)(30 279 RT Kc Kp = = = 2 HI H 2 + I 2 I 0.150 M 0 0 C -2x +x +x E (0.150-2x) x x (0.150-2x) = 0.104 x = 0.023 [ ][ ] [ ] 2 3 3 2 2 NH H N NAME: CHM 2046 Quiz 1A Spring, 2006 Be careful to give your final answer to the correct significant figures. SEE THE END FOR USEFUL INFORMATION. Show your work. 1. a) (2 points each) Balance the following reactions and write down their mass-action expression, Q c . 2 NH 3 (g)    N 2 (g) + 3 H 2 (g) Q c = 2 H 2 O 2 (g) + 2 NO (g) 2 H 2 O (g) + N 2 O 4 (g) Q c = b) (5 points) At a particular temperature, K p = 279 for the reaction 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) In a particular reaction carried out, the pressures of the gases at a particular time are 0.12 atm (atmospheres) of SO 2 , 1.2 atm of O 2 , and 2.4 atm of SO 3 . Has the reaction reachedequilibrium yet? Explain. If not, in which direction is it proceeding? Explain.

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