What is the approximate ratio of the number of oxygen to nitrogen molecules in Earth's lower atmosphere?
A) 1 oxygen molecule to every 4 nitrogen molecules
B) 4 oxygen molecules to every 1 nitrogen molecule
C) equal numbers of oxygen and nitrogen molecules
D) only 1 oxygen molecule to every 100 nitrogen molecules, or about 1%

Question

Quizplus · Accepted Answer

The Earth's lower atmosphere is composed of approximately 78% nitrogen and 21% oxygen by volume. This translates to roughly 1 oxygen molecule for every 4 nitrogen molecules, making option A the correct choice.

What Is the Approximate Ratio of the Number of Oxygen