Q.
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 1H atoms are replaced by 2H atoms is
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Some Basic Concepts of Chemistry
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Answer: 7.50
Solution:
Weight of 11H in person =75×10010=7.5kg
Now if 1H1 is replaced by 1H2
Than person will gain weight by =7.5kg