Molecular mass of water ______.

18 u

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16 u

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15 u

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10 u

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Solution

The correct option is C $18 u$
As we know the molecular formula of water is H2O which means that one molecule of water contain 2 atoms of hydrogen and 1 atom of oxygen.
Then weight of 1 atom of hydrogen= 1 u
so weight of 2 atom= 2 u
Weight of 1 atom of oxygen= 16 u
Then molecular weight of water= 2* weight of 1 atom of hydrogen+ weight of 1 atom of oxygen
Thus molecular weight of water is approximately 2+16 u = 18 u

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