Answer
$-\frac{1}{2}\Delta H_{1}$
Work Step by Step
The equation is reversed and scaled by a factor of $\frac{1}{2}$ so we multiply $\Delta H$ of the original equation by $-\frac{1}{2}$ to get the new $\Delta H$.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 6 - Sections 6.1-6.10 - Exercises - Problems by Topic - Page 289: 77c
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