Question

0.1 mole of CH4 reacts completely with excess air, if 1 liter of bone dry air is produced at 27^oC and 25 atm, what is the humidity?

(a) 4%

(b) 15%

(c) 20%

(d) 52%

The question was asked in exam.

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

Answer 1

Right choice is (c) 20%

The explanation: Moles of bone dry air = 1, moles of H2O produced = 0.2, => humidity = 0.2/1*100 = 20%.