Question

What is the heat transferred to the system, if a change in enthalpy is 25 J and change in pressure is 5 Pa at volume 3 m^3?

(a) 5 J

(b) 10 J

(c) 15 J

(d) 20 J

This question was addressed to me during an internship interview.

This interesting question is from Application of the Energy Balance to Closed Systems topic in portion 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

Correct option is (b) 10 J

Easiest explanation: Q = ∆H – V∆P = 25 – 3*5 = 10 J.