If 900 Joules of heat is added to a system, while the system does 700 Joules, by how much does the internal energy increase?
A) -1600 J
B) -200 J
C) 900 J
D) 200 J
E) 1600 J

Question

Quizplus · Accepted Answer

The change in internal energy (ΔU) is given by the first law of thermodynamics: ΔU = Q - W, where Q is the heat added to the system and W is the work done by the system. Here, ΔU = 900 J - 700 J = 200 J.

If 900 Joules of Heat Is Added to a System