For the chemical reaction

$Ca(s)+\frac{1}{2}{O}_2(g)$CaO$(s)$

$H=-635k\frac{J}{m}ol.$

What is the molar enthalpy $($in $k\frac{J}{m}ol)$ for the reaction $2$CaO$(s)2Ca(s)+O_2($g$)?$

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