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 75kg person would gain if all ${}^{1}H$ atoms are replaced by ${}^{2}H$ atoms is:

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 75kg person would gain if all

{}^{1}H

atoms are replaced by

{}^{2}H

atoms is:

Quantrex Academy · Accepted Answer

Correct answer: B. 7.5 kg

Weight of Hydrogen in body of 75 kg person = 75 × (10)/(100) = 7 .5 kg On replacing ^ 1 H by ^ 2 H , the new weight of H = 7 .5 × 2 = 15kg Weight increase = 7 . 5kg

The most abundant elements by mass in the body of a healthy human...

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