Halliday, Resnick & Walker — The Kinetic Theory of Gases: Problem 11

Air that initially occupies $0.140 \text{ m}^3$ at a gauge pressure of $103.0 \text{ kPa}$ is expanded isothermally to a pressure of $101.3 \text{ kPa}$ and then cooled at constant pressure until it reaches its initial volume. Compute the work done by the air. (Gauge pressure is the difference between the actual pressure and atmospheric pressure.)