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Unformatted text preview: Version 227 – Quiz 2 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Constants R = 8 . 314 J · K − 1 · mol − 1 Definitions Q ≡ [C] c [D] d [A] a [B] b Equations Δ G = Δ H- T Δ S Δ G ◦ =- RT ln K ln K 2 K 1 = Δ H ◦ R parenleftbigg 1 T 1- 1 T 2 parenrightbigg Q = K [at equil.] K w = [H + ][OH − ] 001 5.0 points The equilibrium constant of a certain reaction is experimentally determined at 200 K and 250 K and is found to be equal to 10 10 and 10 16 , respectively. What can you say for certain about the reaction? 1. It will become non-spontaneous at higher temperatures 2. nothing can be said for certain 3. It is exothermic 4. It is endothermic correct Explanation: According to the van’t Hoff equation, a di- rect proportionality between T and K requires a positive value for Δ H o ....
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This note was uploaded on 08/24/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.
- Spring '07