One mole of N 2 gas is maintained at room temperature (20 ºC) and at a pressure of 5 atm. It is allowed to expand adiabatically and quasi-statically until its pressure equals the room pressure of 1 atm. It is then heated at constant pressure until its temperature is again 20 ºC During this heating the gas expands. After it reaches room temperature, it is heated at constant volume until its pressure is 5 atm. It is then compressed at constant pressure until it is back to its original volume. Net heat released by the gas is n × 100 J. Find n.