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
$2KClO_3(s)+2KCl(s)\rightarrow 3O_2(g)\space \Delta H=-78.0KJ$
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