Answer
See the answer below.
Work Step by Step
Bonds broken: C=C, H-H
Bonds formed: C-C, 2 C-H
$\Delta H=(610+436)-(346+2×413)=-126\ kJ/mol$
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 8 Bonding and Molecular Structure - Study Questions - Page 337c: 53
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