Question

What is the heat transferred to the system, if change in enthalpy is 15 J and change in volume is 2 m^3 at 5 Pa?

(a) 5 J

(b) 8 J

(c) 10 J

(d) 12 J

This question was posed to me in an interview for job.

I'm obligated to ask this question of Application of the Energy Balance to Closed Systems in chapter Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances: How to Account for Chemical Reaction of Basic Chemical Engineering

Answer 1

The correct choice is (a) 5 J

Explanation: Q = ∆H – P∆V = 15 – 5*2 = 5 J.