A person using an oxygen mask is breathing air that is 33% oxygen. what is the partial pressure of the o2, when the air pressure in the mask is 110 kpa

The partial pressure of the O2 is 36.3 kiloPascal when the air pressure in the mask is 110 kiloPascal based on the isotherm relation. This problem can be solved by using the isotherm relation equation which stated as Vx/Vtot = px/ptot, where V represents volume, p represents the pressure, x represents the partial gas, and tot represents the total gas. Calculation: 33/100 = px/110 - - > px = 36.3