Organic Chemistry (8th Edition)

Published by Pearson
ISBN 10: 0321768418
ISBN 13: 978-0-32176-841-4

Chapter 4 - The Study of Chemical Reactions - Problems - Page 144: Problem 4-9 c

Answer

$\Delta$H° (reaction) = -118 kJ/mol (-28 kcal/mol)

Work Step by Step

The overall reaction enthalpy can be calculated by summing the energy required to break the CH3CH2-H and Cl-Cl bonds (+652 kJ/mol or +156 kcal/mol) with the energy released from the CH3CH2-Cl and H-Cl bonds formation (-770 kJ/mol or -184 kcal/mol). The resulting value is -118 kJ/mol (-28 kcal/mol).
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