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 `.^(1)H` atoms are replaced by `.^(2)H` atoms is:

Options

A. 7.5 kg
B. 10 kg
C. 15 kg
D. 37.5 kg

Answer

A

Explanation

As the human adult contains `10%` of `.^(1)H`,
`therefore .^(1)G" present"=(10)/(100)xx75=7.5kg`
If all `.^(1)H` were replaced by `.^(2)H`, i.e., each atom has double the weight now, then gain in weight = 7.5 kg (H now present will be 15 kg).