Question

25 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?

(a) 10%

(b) 100%

(c) 500%

(d) 1000%

The question was posed to me during an internship interview.

This interesting question is 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) 1000%

For explanation: Moles of bone dry air = 5, moles of H2O produced = 50, => humidity = 50/5*100 = 1000%.