A cylinder with a piston contains 0.700 mol of nitrogen 1.8210⁵ Pa and 488 K. Nitrogen can be treated as a diatomic ideal gas. The gas is first compressed at constant pressure to half its original volume, then expanded adiabatically back to its original volume, and finally heated at constant volume to the original pressure.

A. Indicate the series of processes on a pV diagram. B. Calculate the temperatures at the beginning and end of the adiabatic expansion C. Calculate the minimum pressure. D. Comment and explain the expected changes in the processes if instead of nitrogen the gas were ammonia.