Would the partial pressure of oxygen in the air change as a function of altitude?

Question

A. none of these

B. Yes, the partial pressure of oxygen in air increases with increasing altitude.

C. Yes, the partial pressure of oxygen in air decreases with increasing altitude.

D. No, the partial pressure of oxygen in air stays constant since the composition of air doesn't change.

E. No, the partial pressure of oxygen in air stays constant since the total pressure of air doesn't change.

Answer 1

Yes it would, think about an airplane, if you lose cabin pressure you have to breath in oxygen from a mask because there is not enough in the air. So the partial pressure of air decreases with altitude.

The pressure of oxygen decreases exponentially due to the compressibility of oxygen is not a linear function of altitude.

Answer is C

Answer 2

C. The partial pressure is expressed in psi.
The percentage remains the same but the pressure
number changes with altitude.
If you did your reading you would have caught this.