If the expansion process is polytropic, calculate power output, rate of heat transfer and rate of change in entropy

Question

Air at 327⁰C and 400 kPa with a volume flow rate of 5 m³/s flows through a turbine nd exits at 100 kPa and 182⁰ C. If the expansion process is polytropic, calculate power output, rate of heat transfer and rate of change in entropy (specific heat t constant pressure of air = 1.0035 kJ/kg-K, and Gas constant of air = 0.287 kJ/kg-K)