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Hydrogen:66.6666...% Oxygen:33.3333...%

H2O is comprised of 2 hydrogens and 1 oxygen (thus why its called H(ydrogen)2 O(xygen))

****************2nd Opinion****************

Though the question doesn't really say so, it's common to for these types of questions to mean percentage by mass. In that case, the answers would be

16/18 = 0.88888 = 88.9% O

2/18 = 0.111111 = 11.1% H

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14y ago

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