One kilogram of steam is expanded isothermically (in a closed system) from state 1 with P1 = 4 MPa and T1 = 400C to state 2 with P2 = 0.8 MPa. Determine the work and heat involved in this process (in or out), if the process is reversible. If using the data listed in the steam table If steam is assumed to follow the Van der Waals equation with a = 0.5542 Pa.m6/mol2 ; b = 3.051 x 10-5 m3/mol ; Cp/R = 3.47 + (1.45 x 10-3) T