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# quiz2 - th3459 Quiz 2 VANDEN BOUT(53585 This print-out...

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th3459 – Quiz 2 – VANDEN BOUT – (53585) 1 This print-out should have 7 questions. Multiple-choice 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. 0 . 1456 2. 0 . 0970667 3. 0 . 0485333 correct 4. 0 . 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) 0 . 75 M = 0 . 0485333 M 002 10.0 points Calculate the equilibrium constant at 25 C for a reaction for which Δ G 0 = - 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 0 = - 5640 cal / mol At equilibrium Δ G 0 = - 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 CO 2 and 0.10 mole CO. If a small amount of carbon is added to this vessel and the temperature is raised to 1000 C CO 2 (g) + C(s) 2 CO(g) , will more CO form? The value of K c for this reaction is 1.17 at 1000

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