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 H1 atoms are replaced by H2 is :
A
7.5 kg
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B
10 kg
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C
15 kg
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D
37.5 kg
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Solution
The correct option is A 7.5 kg Mass of hydrogen in adult human = (10/100)×75=7.5kg
Replacing H1 by H2 would replace 7.5 kg with 15 kg. ∴ Net gain = 7.5kg