Consider the following chemical equation. Solve the unknown quantity.

$2$ H$2$O $+$ O$22$ H$2$O$2$

$38\mathrm{.}7$g $+?=56\mathrm{.}2$g

If $38\mathrm{.}7$ grams of H$2$O is made to react with oxygen, O$2,$ to produce $56\mathrm{.}2$g of H$2$O$2,$ how many grams of O$2$ were used in the reaction.

Consider the following chemical equation. Solve the unknown quantity.

$2H_{2}O+O_{2}2H_2{O}_2$

$38\mathrm{.}7g+?=56\mathrm{.}2g$

If $38\mathrm{.}7$ grams of $H_{2}O$ is made to react with oxygen, $O_2,$ to produce $56\mathrm{.}2g2$ of $H_2{O}_2,$ how

many grams of $O_2$ were used in the reaction.