# The most abundant elements by mass in the body of a healthy human adult are :

Question:

The most abundant elements by mass in the body of a healthy human adult are : Oxygen $(61.4 \%)$; Carbon $(22.9 \%)$, Hydrogen $(10.0 \%)$; and Nitrogen $(2.6 \%)$. The weight which a $75 \mathrm{~kg}$ person would gain if all ${ }^{1} \mathrm{H}$ atoms are replaced by ${ }^{2} \mathrm{H}$ atoms is

1. 15 kg

2. 37.5 kg

3. 7.5 kg

4. 10 kg

Correct Option: , 3

Solution:

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