Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry

Question

The most abundant element 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

  • 15 kg

  • 37.5 Kg

  • 7.5 Kg

  • 40 Kg

Answer

C.

7.5 Kg

Mass in the body of a healthy human adult has :-
Oxygen = 61.4%, Carbon = 22.9%,
Hydrogen = 10.0% and Nitrogen = 2.6%
Total weight of person = 75 kg
Mass due to 1H is =
(10/100)x 75 = 7.5kg
1H atoms are replaced by 2H atoms.
So mass gain by person =7.5 kg

More Chapters from Some Basic Concepts of Chemistry