If 20 percent of the air is composed of O₂, what is the partial pressure of oxygen at an altitude of 20000 feet where atmospheric pressure is 350 mmHg? A)20 mmHg B)70 mmHg C) 152 mmHg D) 760 mmHg

Question

Quizplus · Accepted Answer

If 20 percent of the air is composed of oxygen, then the partial pressure of oxygen can be calculated by multiplying the total pressure of the air by the fraction of oxygen in the air, which gives:

Partial pressure of oxygen = 0.20 x 350 mmHg = 70 mmHg

Therefore, the correct answer is B.

If 20 Percent of the Air Is Composed of O2

If 20 Percent of the Air Is Composed of O₂