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Math, simplified:
H20 = H+H+O.
There are 3 total molecules, which make up 100% of the mass.
100/3 = 33.333%
2 of those molecules are H, while one is O.
Since each molecule is 33.333%,
33.333% * 2=66.666%,
and 33.333% * 1=33.333%
Therefore, 2H = 66.666% of the mass, while O = 33.333%.
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