Question

If a gas absorbs 200J of heat and expands by 500 cm3 against a constant pressure of 2×105Nm−2, then the change in internal energy is:

Answer 1

The correct answer is 100 j.
From first law of thermodynamics,Change in internal energy isΔU=q−w=q−PΔV=200−2×105×500×10−6=100JHence, the correct answer is 100J.