The following thermochemical equation is for the reaction of $H_2{O}_2(l)$ to form $H_{2}O(l)$ and $O_2(g).$

$2H_2{O}_2(l)2H_{2}O(l)+O_2(g)H=-196kJ$

How many grams of $H_2{O}_2(l)$ would have to react to produce $29\mathrm{.}7kJ$ of energy?

grams

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