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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 _____

A

7.5 kg

B

10 kg

C

15 kg

D

37.5 kg

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