Question

In an open system, what is the enthalpy change is heat taken from it is 10 J?

(a) 0

(b) -10 J

(c) 10 J

(d) Cannot be determined

I have been asked this question during an online interview.

The origin of the question is Simplifications of General Energy Balance 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 choice is (b) -10 J

For explanation I would say: For an open system, ∆H = Q, => ∆H = -10 J.