The approximate composition of the atmosphere is shown in the pie-chart. The two major components are nitrogen and oxygen. Which ratio is CLOSEST to the ratio volume of nitrogen : volume of oxygen in the air?

A) 1:3
B) 2:1
C) 2:3
D) 4:1

D) 4:1

Explanation:

Nitrogen and oxygen have a vital role in a living organisms. Nitrogen used to make protein and oxygen used as the main energy source. The atmosphere of earth is mainly composed of nitrogen, a good portion of oxygen, and a small chunk of argon. The estimated value is about 78% nitrogen, 20.9% oxygen, 0.9% argon and 0.2% other gas. Even carbon dioxide only made 0.04% of the atmosphere. The ratio for the gas will be=

volume of nitrogen : volume of oxygen

78%:20.9%

3.7:1

The closest answer to 3.7:1 will be 4:1