If you were to take a breath of pure oxygen,from a tank,you'd be getting about ____ the amount of oxygen you'd get by taking a normal breath of our atmosphere.
A) one-fifth
B) half
C) twice
D) three times
E) five times

Question

Quizplus · Accepted Answer

The Earth's atmosphere is composed of approximately 21% oxygen. Breathing pure oxygen from a tank means you are inhaling 100% oxygen, which is roughly five times the amount of oxygen compared to a normal breath of atmospheric air.

If You Were to Take a Breath of Pure Oxygen,from