Mass percentage of deuterium in heavy water is:

Same as that of protium in water

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11.1

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20.0

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Cannot be predicted

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Solution

The correct option is C $20.0$
The formula of heavy water is $D_{2} O$
$Molecular mass = 20 g$
$% of deuterium = \frac{4}{20} \times 100 = 20 %$

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