Question

The weight percentage of deuterium in heavy water is:

• A. 20
• B. 11.11
• C. 4
• D. 22

Answer 1

The correct option is A 20

The Molecular formula of heavy water is $D_{2}O$

Molecular weight of $D_{2}O$​ = $20$

% $D$ in $D_{2}O$ ​= $\frac{4}{20}\times 100$

= $20$ %