Question
What is the molar mass of heavy water?
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Answer
Molar mass of heavy water is $20\text{g}{~mol}^{-1}$,
$[\because\text{D}_2\text{O}=2\text{D}+10\\=2\times2+1\times16=4+16=20]$
$[\because\text{D}_2\text{O}=2\text{D}+10\\=2\times2+1\times16=4+16=20]$
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