Question

A system absorb $600\, J$ of heat and work equivalent to $300\, J$ on its surroundings. The change in internal energy is:

• A. 300 J
• B. 400 J
• C. 500 J
• D. 600 J

Answer 1

Answer: (A)

300 J

Answer 2

We know that $\Delta E=Q+W$ $=600+(-300)$ $=300\, J$ $W=300$, because the work done by the system.