Question

The feed of a process simulator is 2 mole with enthalpy 4 J/mole, the heat input is 6 J, and the work performed is 10 J, what will be the product enthalpy if a mole of the product are 2?

(a) 1 J/mole

(b) 2 J/mole

(c) 3 J/mole

(d) 5 J/mole

I have been asked this question during an online interview.

The above asked question is from Unsteady-State Material and Energy Balances topic in portion 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 (b) 2 J/mole

The best I can explain: Energy balance, 2*H = 2*4 + 6 – 10 = 4, => H = 2 J/mole.