1) A piston-cylinder device contains 2.2 kg of nitrogen initially at 100 kPa and 25C. The nitrogen is now compressed slowly in a polytropic process during which PV13 = constant until the volume is reduced by one-half. i. List all information given. ii. Express the final energy balance for this process. iii. Determine the work done and the heat transfer for this process. iv. State any difficulty encountered by you when solving this problem.