maximum torque is develo
the torque developed is low at maximum power because of many other thing that helps your torque reduce when power is increased,
one example is when you start the engine, during starting you need more torque to turn your engine, but once your engine is running the...
I think h2oski1326 was right you need to consider the isentropic process because according to your problem the gas expands in adiabatic process, that means you have a closed sytem, and if the system is closed there is no cahange in temperature. you can solved h2 using temperature from h1.