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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 kg person would gain if all the 1H atoms are replaced by 2H atoms is:

A
15 kg
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B
37.5 kg
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C
7.5 kg
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D
10 kg
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