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Relative molecular mass of water (H(2)O)...

Relative molecular mass of water `(H_(2)O) `is calculated as follows: A water molecule is made of 2 atoms of hydrogen and one atom of oxygen.

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So, the relative molecular mass of water = (2 `xx` mass of hydrogen) + (1 `xx` mass of oxygen)
`= (2 xx 1) + (1 xx 16) = 18`
i.e., one molecule of `H _(2)O` is 18 times as heavy as `(1)/(12 ^(th))` of the mass of a carbon `-12.`
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