A mass of 1.8kg of air at 120kPa and 24C is contained in a gas-tight, frictionless piston-cylinder device. The air is now compressed to a final pressure of 600kPa. During the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. Calculate the magnnitude of work input during this process. Take the gas constant of air as R=0.287kJ/kgK. The magnitude work input during this process is kJ