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problem_set_viii_answers - CHEM 302 Organic Chemistry I...

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CHEM 302 Organic Chemistry I Problem Set VIII Chapter 8 Answers 1) The bond energies for Cl-Cl, H-Cl, and CH 3 -H are 58, 103, and 104 kcal/mol, respectively. Draw an energy diagram depicting the following reaction sequence: Cl Cl Cl + Cl Cl + CH 4 H Cl + CH 3 This diagram might best be approached in the following manner: Cl 2 2Cl Cl CH 3 + H Cl CH 3 + H H-Cl + CH 3 +58 kcal +104 kcal -103 kcal +59 kcal Thus we see that the reaction has a greater cost in breaking bonds than is regained in making bonds. An alternate diagram would look like this: Cl 2 + CH 4 2Cl + CH 4 HCl + CH 3
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Either one shows what we want it to show—the reaction is endothermic. 2) Calculate the Δ H for the reaction given in problem 1. Is this reaction exothermic or endothermic? Sort of answered above. The Δ H = +59 kcal, so the reaction is endothermic. 3) The reaction shown below is a reversible process, with K close to unity. CH 3 CH 2 OH + (CH 3 ) 2 CH C OH O (CH 3 ) 2 CH C OCH 2 CH 3 O + H 2 O a) Assuming that K = 1 and that the concentration of each starting material is 0.5 M ,
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