Question

Enthalpy of air is 5 J and enthalpy of water vapor is 10 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?

(a) 50%

(b) 100%

(c) 150%

(d) 200%

I have been asked this question in a job interview.

My query is from Degrees of Freedom Analysis in Steady-State Process in chapter Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

Answer 1

Right option is (d) 200%

The explanation: 25 = 5 + 10*H, => H = 2, => H = 200%.