Nitrogen gas enters a turbine operating at steady state at 10 MPa, 26oC with a mass flow

Question:

Nitrogen gas enters a turbine operating at steady state at 10 MPa, 26oC with a mass flow rate (m) of 1 kg/s and exits at 4 MPa, - 28oC. Using the RG model (N-O charts) and ignoring the heat transfer with the surrounding, determine (a) the work developed (Wext). (b) What-if Scenario: What would the work developed be if the mass flow rate were 0.5 kg/s?