When the air in a testing chamber is specially mixed so that its oxygen content is 10% and its overall air pressure is 400 mm Hg, then PO₂ is
A) 400 mm Hg.
B) 82 mm Hg.
C) 40 mm Hg.
D) 21 mm Hg.
E) 4 mm Hg.

Question

Quizplus · Accepted Answer

The partial pressure of oxygen (PO₂) in a mixture can be calculated using the formula: PO₂ = total pressure * fraction of oxygen. Here, the total pressure is 400 mm Hg and the oxygen content is 10%, or 0.10. Therefore, PO₂ = 400 mm Hg * 0.10 = 40 mm Hg.

When the Air in a Testing Chamber Is Specially Mixed