Question

For an open unsteady state system, 5 J of heat was supplied and 10 J of work was done by the system, what is the value of a change in enthalpy?

(a) – 5 J

(b) 5 J

(c) 10 J

(d) 15 J

I have been asked this question during an online exam.

The doubt is from Vaporization and Energy Balances for Open, Unsteady-State Systems in division Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

Answer 1

Correct option is (a) – 5 J

Explanation: ∆H = 5 – 10 = – 5 J.