Agas contained within a piston-cylinder assembly undergoes three processes in series:

process 1-2: constant volume from p1 = 1 bar, v1 = 4 m3 to state 2, where p2 = 2 bar.

process 2-3: compression to v3 = 2 m3, during which the pressure-volume relationship is pv = constant.

process 3-4: constant pressure to state 4, where v4 = 1 m3.

sketch the processes in series on p-v coordinates and evaluate the work for each process, in kj.