Question

What is the partial pressure of a 40% gas in a system with vapor pressure 1 mm Hg?

(a) 0.2 mm Hg

(b) 0.4 mm Hg

(c) 0.6 mm Hg

(d) 0.8 mm Hg

I had been asked this question by my college professor while I was bunking the class.

The question is from Vapor-Liquid Equilibria in Binary Systems in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

Answer 1

Correct choice is (b) 0.4 mm Hg

The explanation: p = 0.4*1 = 0.4 mm Hg.