Hydrogen enters the turbine of an Ericsson cycle at 1500 kPa and 900 K, with a mass

Question:

Hydrogen enters the turbine of an Ericsson cycle at 1500 kPa and 900 K, with a mass flow rate of 1 kg/s. The temperature and pressure at the inlet to the compressor are 320 K and 150 kPa respectively. Determine
(a) The net work (wnet) output per unit mass of air. Use the PG model.
(b) The thermal efficiency (ηth) of the cycle,