P4) A gas enters at condition of 10 bar and 500 C enters an expander, to be then exhausted at 2 bar. If the efficiency of the equipment is 0.8.

What is the temperature at the exit? What is the work output per mole? For the gas consider A- 6, 8-1 x 10^-3(K^-1). C-0, 0=15 x 10^3 (K^2)