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.