A 0.25m3 insulated piston-cylinder device initially contains 0.7kg of air at 20C. At this stage, the piston is free to move. Now air at 500kPa and 70C is allowed to enter the cylinder from a supply line until the volume increases by 50%. Using constant specific heat at 300K, determine (a) the final temperature, (b) the amount of mass that has entered, (c) the work done, and (d) the entropy generated