A newly developed compound is being considered for use as the working fluid in a small Rankine-cycle power plant driven by a supply of waste heat. Assume the cycle is ideal, with saturated vapor at 400 F entering the turbine and saturated liquid at 70 F exiting the condenser. The only properties known for this compound are molecular weight of 80 lbm/lb mol, ideal gas heat capacity Cpo 0.20 Btu/lbm R and Tc 900 R, Pc 750 lbf/in 2. Calculate the work input, per lbm, to the pump and the cycle thermal efficiency.