A gas contained within a piston–cylinder assembly undergoes three processes in series:

Process 1–2: Constant volume from p1=1 bar ,V1=4m^{3} to state 2, where p2=2 bar.

Process 2–3: Compression to V3=2m^{3} , during which the pressure-volume relationship is pV=constant.

Process 3–4: Constant pressure to state 4, where V4=1m^{3}

Process 1–2: Constant volume from p1=1 bar,V1=4m^{3} to state 2, where p2=2 bar.

Process 2–3: Compression to V3=2m^{3} , during which the pressure-volume relationship is pV=constant.

Process 3–4: Constant pressure to state 4, where V4=1m^{3}

Sketch the processes in series on p–V coordinates and evaluate the work for each process, in kJ.