Question

The partial pressure of a system at 49^oC is 125 mm Hg and saturated ammonia vapor has partial pressure 20 mm Hg at 49^oC, what is the fraction of ammonia vapor in the system?

(a) 0.04

(b) 0.08

(c) 0.16

(d) 0.24

This question was posed to me during an online interview.

My question is based upon Saturation in portion Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

Answer 1

Correct choice is (c) 0.16

Explanation: Fraction of ammonia vapor = 20/125 = 0.16.