A 200-m^3 rigid tank initially contains atmospheric air at 100 kPa and 300 K and is to be used as a storage vessel for compressed air at 1 MPa and 300 K. Compressed air is to be supplied by a compressor which takes in atmospheric air at Po = 100 kPa and To = 300 K. Determine the minimum amount of work (i.e. the process is reversible) required for this process.