Agas contained in a piston–cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 1 bar, v1 = 1 m3, u1 = 400 kj and p2 = 6 bar, v2 = 0.167 m3, u2 = 420 kj: process a: constant-volume process from state 1 to a pressure of 6 bar, followed by a constant-pressure process to state 2. process b: process from 1 to 2 during which the pressure volume relation is pv = constant. kinetic and potential effects can be ignored. for each of the processes a and b, (a) evaluate the work, in kj, and (b) evaluate the heat transfer, in kj.