Dry air is 78.08% nitrogen, 20.95% oxygen and 0.93% argon with the 0.04% being other gases. If the atmospheric pressure is 760.0 torr, what is the partial pressure of oxygen in dry air?

Question

Quizplus · Accepted Answer

We need to calculate the partial pressure of oxygen in dry air. 
Given: 
Total pressure of dry air = 760.0 torr 
Percentage of oxygen in dry air = 20.95%

To find the partial pressure of oxygen, we need to multiply the total pressure by the percentage of oxygen in dry air (in decimal form):

Partial pressure of oxygen = Total pressure x Percentage of oxygen
                        = 760.0 torr x 0.2095 
                        = 159.2 torr

Therefore, the partial pressure of oxygen in dry air is 159.2 torr.

Dry Air Is 78