A prospective client attending the forum has requested consultancy services. You have requested the specifications of the system and the client informs you that oxygen is compressed reversibly and polytropically in a cylinder from 1.05 bar, 15C to 4.2 bar in such a way that one-third of the work input is rejected as heat to the cylinder walls. Calculate the final temperature of the oxygen. Assume oxygen to be a perfect gas and take cv-0.649 kJ/kgK.