Chemistry 12 Homework Set 1 – Graded Problem Solutions

Chemistry 12 Homework Set 1 – Graded Problem Solutions Spring 2011 (c) ghep 1: CHECH CEN:" break now connect- Go7 the-datg +358 make break C-C-347 C-H/2413 make-H-407 H total-814 H + H+CEN: DEWHO-CHE CHE CEN step 2: break make O-H -467 C-0388 CCT -267 ↑ C-H 4413 total-734 total +771 HOACH-CN 080137 CH2=CH け +H20 cps- (b) C=C614) σ - CCT 347 (a) H-CEN: 2674 (d) 5 calculated from band energies was -436/d for frist step. But when that strained" 3-membered rong opens up, thasa an additional 120 k/wd is released, better estimate would be 015=-43-180=-163 (e) If we add the two rxus, + HCN got 8 CH2=CH-CN + H₂O DE = -163+37=-126 kid (notice that you can calculate this directly. with bond energies & then 100 for relief of straon!) CH2-CL My calc using NIST data gave 05 = -139 kmd, so the (stram-adjusted) band-energy cale was not bad. tatal (+1) H H CH-C-CN