Question

Enthalpy of air is 10 J and enthalpy of water vapor is 15 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?

(a) 20%

(b) 50%

(c) 100%

(d) 180%

I had been asked this question in semester exam.

The question is from Degrees of Freedom Analysis in Steady-State Process in section 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

Correct option is (c) 100%

To elaborate: 25 = 10 + 15*H, => H = 1, => H = 100%.