An old abandoned saltmine, 100 000 m3 in volume, contains air at 290 K, 100 kPa. The

Question:

An old abandoned saltmine, 100 000 m3 in volume, contains air at 290 K, 100
kPa. The mine is used for energy storage so the local power plant pumps it up to 2.1 MPa using outside air at 290 K, 100 kPa. Assume the pump is ideal and the process is adiabatic. Find the final mass and temperature of the air and the required pump work.