In a piston-cylinder device there is 11.5 ft3/lbm of nitrogen at 77 F(state1). The gas undergoes an isothermal process to state 2, where the specific volume is 0.36 ft3/lbm. then it expands at constant pressure to state 3, where v3=v1. finally it returns to its initial state by a path at constant volume.

a) draw the schematic of the cylindrical process of a pv diagram.

b) determine the value p2, with psia, t3 in rankine

c) Determine the work and heat in the three btu/lbm processes. Consider the specific heats constant at 80F.