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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 1H atoms are replaced by 2H atoms is...


Solution

Since H is 10% and 1H atoms are replaced by 2Hatoms then weight of hydrogen is just doubled. Weight gain will be 75 x .1 = 7.5 kg

Chemistry

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