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questions%205_fa10_ans - Chemistry 030-205-01 October 7...

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Chemistry 030-205-01 October 7, 2010 Problem Set 5 1. Rank the following in order of stability (lowest to highest): A B C D D<B<C<A (mono<di<tri<tetra substituted) 2. The heats of formation ( H f ) and the heats of hydrogenation ( H h ) of several isomeric pentenes are given below. By how much (in kcal/mol) is 2-methylbutane more stable than pentane? Pick any of the first 3 and compare with one of the last 2: C + H 2 -5 kcal/mol -30 kcal/mol C + H 2 -9 kcal/mol (-35 kcal/mol) -28 kcal/mol (-37 kcal/mol) 2 kcal/mol more stable H f (kcal/mol) 5.0 7.5 6.5 9.0 10.0 H h (kcal/mol) 30.0 27.5 28.5 28.0 27.0
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3. Consider the addition of HCl to the following compounds. Which
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