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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? 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) 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 . 2NO (g) + Br 2 (g) ⇔ 2NOBr (g) 4. (14 points) 1.0 mole of N 2 (g) and 1.0 mole of O 2 (g) are placed into a 1 liter flask at 500 °C. (g) are placed into a 1 liter flask at 500 °C....
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