Question

The specific volume of a gas is 2 m^3/Kg, at 12 Pa, H = 30 J/Kg and at 15 Pa, H = 45 J/Kg, what is the heat transferred to the system?

(a) 6 J/Kg

(b) 9 J/Kg

(c) 12 J/Kg

(d) 15 J/Kg

This question was addressed to me during an interview for a job.

My question is based upon 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

The correct answer is (b) 9 J/Kg

For explanation: Q = ∆H – V∆P = (45 – 30) – 2(15 – 12) = 15 – 6 = 9 J/Kg.