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Unformatted text preview: CHAPTER 14 Practice problems 1. (4 points) Sulfur trioxide (SO 3 ) is placed in a container and allowed to equilibrate. The reaction SO 3 (g) SO 2 (g) + 1/2O 2 (g) is endothermic. In which direction (Left to Right; or Right to Left; or No Change) will the reaction go: a) if additional SO 2 is added to the system? b) if the volume of the container is decreased? c) if the temperature is increased ? d) if a catalyst is added to speed up the reaction? A: a) R to L b) R to L c) L to R d) no change 2. (6 points) The equilibrium constant for the reaction N 2 (g) + 3 H 2 (g) 2 NH 3 (g) equals K c = 0.4 at 400 C. Calculate K c for BOTH of the following TWO reactions: a) 1/2 N 2 (g) + 3/2 H 2 (g) NH 3 (g) b) 2NH 3 (g) N 2 (g) + 3 H 2 (g) A: a) 0.63 b) 2.5 3.(14 points) 2.0 moles of NO and 1.0 mole of Br 2 are placed into a 1 liter flask at 500 C. At equilibrium the concentration of NOBr is 0.4 M. Calculate K c ....
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