Question

Enthalpy of air is 20 J and enthalpy of water vapor is 6 J, if the total enthalpy of the system is 23 J, what is the humidity of the system?

(a) 10%

(b) 20%

(c) 40%

(d) 50%

This question was addressed to me during an interview for a job.

The query is from Degrees of Freedom Analysis in Steady-State Process in division 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) 50%

Explanation: 23 = 20 + 6*H, => H = 0.5, => H = 50%.