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Josephine · Answer 1 · 2019-05-27T10:05:05+0000

There are 4 hydrogens on the right side
$(2\mathrm H_2=4\mathrm H)$ , and 2 hydrogens on the left per molecule of
$\mathrm H_2$ . To get the same number of hydrogens on both sides, the coefficient should be 2.

(Then the number of oxygens will be consistent, since
$2\mathrm H_2\mathrm O$ contributes 2 oxygens, and so does
$\mathrm O_2$ .)

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