1.

Relative molecular mass of water (H_(2)O) is calculated as follows:

Answer»

Solution :A water molecule is made of 2 ATOMS of hydrogen and ONE atom of OXYGEN.
So, the relative molecular mass of water
`=(2xx"mass of hydrogen")+(1XX"mass of oxygen")`
`=(2xx1)+(1xx16)`
`=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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