Question:

One mole of oxygen of volume 1 litre at 4 atm pressure attains 1 atm pressure by isothermal expansion. Find work done by the gas.

552 J

155 J

355 J

206 J

Work done is given by: W = nRTln(P1/P2) = PVln(P1/P2) = 4 × 1 × ln(4/1) = 5.545 L-atm = 5.545 × 100 J ≈ 554 J.