A closed, rigid insulated container is occupied by an ideal gas at 50 kPa, 25C. Work is done on the gas by an external motor through an impeller mounted inside the container until the pressure is 100 kPa. For this gas in the temperature range involved, Cp = 0.84 +0.00075T, where T is in Kelvins and Cp is in kJ/kg. K. Calculate: - the enthalpy change of the gas - the work done on the gas