Question

0.2 mole glucose 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) 40%

(b) 80%

(c) 120%

(d) 160%

I have been asked this question in an internship interview.

This is a very interesting 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 (c) 120%

Easiest explanation: Moles of bone dry air = 1, moles of H2O produced = 1.2, => humidity = 1.2/1*100 = 120%.