Argon gas enters a turbine at 1000 psia and 1000 R with a velocity of 300 ft/s

Question:

Argon gas enters a turbine at 1000 psia and 1000 R with a velocity of 300 ft/s and leaves at 150 psia and 500 R with a velocity of 450 ft/s at a rate of 12 lbm/s. Heat is being lost to the surroundings at 75oF at a rate of 80 Btu/s. Using the generalized charts, determine
(a) The power output of the turbine.
(b) The exergy destruction associated with the process.