Nitrogen (n2) gas within a piston–cylinder assembly undergoes a compression from p1 = 20 bar, v1 = 0.5 m3 to a state where v2 = 2.75 m3 . the relationship between pressure and volume during the process is pv1.35 = constant. for the n2 determine (a) the pressure at state 2, in bar, and (b) the work in kj.