a) Determine WS (in kJ/kg ) for turbine I based on the assumption that the turbine is 80% efficient! b) Write the mass and energy balances for the doshed boundary indicated in the Figure. Assume all turbines are adiabatic for this part. Make sure to include all Q and WS contributions as well as mass flow rates relevant for the given system boundary! c) Fill in all the missing pressures (P3,P6,P8,P9)