If 20% of the Air Is Composed of O₂, the Partial

Multiple Choice

If 20% of the air is composed of O₂, the partial pressure of oxygen at an altitude of 20,000 feet where atmospheric pressure is 350 mm Hg is

A) 20 mm Hg
B) 760 mm Hg
C) 70 mm Hg
D) 350 mm Hg
E) 152 mm Hg