Known values: A steady$-$state, adiabatic water pump takes in saturated liquid water at $100$ psia and pumps it up to $1500$ psia and $350$F$.$ If the mass flow rate is $250$ lbm$/$hr$,$ the necessary power input into the pump will be $2\mathrm{.}5$ hp$.$

Need to find: If the water pump from the known values were isentropic the outlet enthalpy would have been $303\mathrm{.}32$ Btu$/$lbm$.$ Use the inlet enthalpy and real outlet enthalpy from the known values to calculate the isentropic efficiency for this water pump.