Question

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

Answer 1

Correct choice is (d) 0.91

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