10 KPa of water vapor at 27^oC is saturated with air in a system,

10-kpa-of-water-vapor-at-27-oc-is-saturated-with-air-in-a-system

10 KPa of water vapor at 27^oC is saturated with air in a system, what is the mole fraction of air?

A. 0.21

B. 0.46

C. 0.79

D. 0.91

This question was posed to me during an interview for a job.

I need to ask this question from Saturation in section Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

Correct choice is D. 0.91

Explanation: Fraction of air = 101.3/(10 + 101.3) = 0.91.