Current Attempt in Progress

Air at $1600K,30$ bar enters a turbine operating at steady state and expands adiabatically to the exit, where the pressure is $1\mathrm{.}45$ bar. The isentropic turbine efficiency is $90\%.$ Assume ideal gas behavior for the air and ignore kinetic and potential energy effects.

Determine the temperature at the exit, in K $,$ and the work developed, in kJ per kg of air flowing.