Air is throttled from 50C and 800 kPa to a pressure of 200 kPa at a rate

Question:

Air is throttled from 50°C and 800 kPa to a pressure of 200 kPa at a rate of 0.5 kg/s in an environment at 25°C. The change in kinetic energy is negligible, and no heat transfer occurs during the process. The power potential wasted during this process is
(a) 0
(b) 0.20 kW
(c) 47 kW
(d) 59 kW
(e) 119 kW