Question

What is the heat transferred to the system, if change in enthalpy is 30 J and pressure, volume changed from 8 Pa, 5 m^3 to 4 Pa, 12 m^3?

(a) 12 J

(b) 15 J

(c) 18 J

(d) 22 J

I had been asked this question during an interview.

My question is from Application of the Energy Balance to Closed Systems in division 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 (d) 22 J

To elaborate: Q = ∆H – V∆P = 30 – (4*12 – 8*5) = 22 J.