The power turbine shown in figure 2 receives gas with a specific enthalpy of 750 kJ/kg and discharges it with a specific enthalpy of 500 kJ/kg. The gas has negligible inlet velocity and an outlet velocity of 200 m/s. If the heat loss from the casing per unit mass of gas is 11 kJ/kg, calculate the power output of the turbine for a gas mass flow rate of 2 kg/s.