Question

The feed of a process simulator is 10 J, the heat input is 5 J, and the work performed is 3 J, what will be the product enthalpy?

(a) 2 J

(b) 5 J

(c) 8 J

(d) 12 J

I had been asked this question during an interview for a job.

My doubt stems from Unsteady-State Material and Energy Balances topic 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 choice is (d) 12 J

To elaborate: Energy balance, H = 10 + 5 – 3 = 12 J.