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Unformatted text preview: th3459 – Quiz 2 – VANDEN BOUT – (53585) 1 This printout should have 7 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A mixture of PCl 5 (g) and Cl 2 (g) is placed into a closed container. At equilibrium it is found that [PCl 5 ] = 0 . 75 M, [Cl 2 ] = 0 . 28 M and [PCl 3 ] = 0 . 13 M. PCl 5 ⇀ ↽ PCl 3 + Cl 2 What is the value of K c for the reaction? 1. . 1456 2. . 0970667 3. . 0485333 correct 4. . 0242667 5. 73 Explanation: [PCl 5 ] = 0 . 75 M [Cl 2 ] = 0 . 28 M [PCl 3 ] = 0 . 13 M K c = [Cl 2 ] [PCl 3 ] [PCl 5 ] = (0 . 28 M)(0 . 13 M) . 75 M = 0 . 0485333 M 002 10.0 points Calculate the equilibrium constant at 25 ◦ C for a reaction for which Δ G = 5 . 64 kcal / mol. 1. 136979 2. 6848 . 96 3. 13697 . 9 4. 13697 . 9 correct 5. 27395 . 9 Explanation: T = 25 ◦ C + 273 = 298 K Δ G = 5640 cal / mol At equilibrium Δ G = RT ln K 5640 = ( 1 . 987 cal / mol · K) × (298 K)(ln K ) K = 13697 . 9 003 10.0 points A 10.0 L vessel contains 0.0015 mole COA 10....
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 Spring '07
 Holcombe
 Chemistry, Equilibrium, Reaction, Kc

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