One lb of oxygen in a piston cylinder assembly undergoes a cycle consisting of the following processes:Process 1-2: Constant-pressure expansion from T1=450R, p1=30 lbf/in^2 to T2=1120R. Process 2-3: Compression to T3=800R and p3 = 53.3 lbf/in^2 with Q(2-3) = -60 Btu. Process 3-1: Constatnt-volume cooling to state 1.Employing the ideal gas model with cp evaluated at T1, determing the change in specific entropy in Btu/lb * R, for each process.