If 50 kJ of heat flows into a system and 35 kJ of work is done by the system, then what is the change in internal energy?
A) 85 kJ
B) 70 kJ
C) 65 kJ
D) 15 kJ
E) 10 kJ

Question

Quizplus · Accepted Answer

The change in internal energy (ΔU) can be calculated using 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 = 50 kJ - 35 kJ = 15 kJ.

If 50 KJ of Heat Flows into a System and 35