undergoes an expansion process in a steady-flow machine with a mass flow rate of 100. The machine is water-cooled.The water mass flow rate is 10 . During the process the gas temperature drops from 200 to 100 °F and the water temperature rises from 70 to 100 °F. lgnoring changes in potential and kinetic energics for the gas, calculate the work of the gas in Btus per hour and watts.