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:

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TestHub · Accepted Answer

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 = 15 kg Weight increase = 7 . 5 kg

Chemistry - Mole Concept Question with Solution | TestHub

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