Answer
C
Work Step by Step
Since the reaction is the reverse of the one where the enthalpy of reaction is given and it's half of the number of moles of HgO in the stoichiometric coefficient, the value must be multiplied by $-1/2$.
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 5 Principles of Chemical Reactivity: Energy and Chemical Reactions - 5-5 Enthalpy Changes for Chemical Reactions - Review & Check for Section 5-5 - Page 201: 1
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