Answer
Please see the work below.
Work Step by Step
We know that the decomposition of 2 mol $KClO_3$ to $KCl$ and $O_2$ produces $KCl$ and the chemical reaction is given as
$2KClO_3(s)+2KCl(s)\rightarrow 3O_2(g)\space \Delta H=-78.0KJ$
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 6 - Thermochemistry - Questions and Problems - Page 261: 6.58
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