Question

1 mole of CH4 reacts completely with excess air, if 5 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?

(a) 25%

(b) 50%

(c) 100%

(d) 200%

This question was addressed to me in quiz.

Question is taken from Material Balance Problems Involving Partial Saturation topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

Answer 1

Right choice is (d) 200%

The explanation: Moles of bone dry air = 1, moles of H2O produced = 2, => humidity = 2/1*100 = 200%.