Question

50 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 25 atm, what is the humidity?

(a) 20%

(b) 80%

(c) 200%

(d) 400%

The question was posed to me in unit test.

I want to ask this question from Material Balance Problems Involving Partial Saturation in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

Answer 1

Correct choice is (d) 400%

Easiest explanation: Moles of bone dry air = 25, moles of H2O produced = 100, => humidity = 100/25*100 = 400%.