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Calculate the molar mass of water if it ...

Calculate the molar mass of water if it contains `50%` heavy water `(D_(2)O)`.

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As water contains 50% `D_(2)O`, this means that it contains `1/2` moles of `H_(2)O` and `1/2` mole of `D_(2)O`. Mass of `1/2` of mole of `D_(2)O = 1/2 xx (2 xx 2 + 16) =10`g
Hence, molar mass of the given sample of water `=9+10 = 19 g mol^(-1)`.
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