Acylinder contains oxygen at a pressure of 2.00 atm. the volume is 4.00 l, and the temperature is 300 k. assume that the oxygen may be treated as an ideal gas. the oxygen is carried through the following processes: (i) heated at constant pressure from the initial state (state 1) to state 2, which has t=450k. (ii) cooled at constant volume to 250 k (state 3). (iii) compressed at constant temperature to a volume of 4.00 l (state 4). (iv) heated at constant volume to 300 k, which takes the system back to state 1.