The most abundant elements by mass in th...

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 kg person would gain if all `.^(1)H` atoms are replaced by `.^(2)H` atoms is:

7.5 kg

10 kg

15 kg

37.5 kg

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