The standard enthalpy change for the following reaction is $433kJ$ at $298K.$

$KCl{O}_4(s)longrightarrowK(s)+\frac{1}{2}C{l}_2(g)+2O_2(g),H=433kJ$

What is the standard enthalpy change for this reaction at $298K?$

$K(s)+\frac{1}{2}C{l}_2(g)+2O_2(g)longrightarrowKCl{O}_4(s)$

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