An insulated piston cylinder device contains 20 L of O2 (use the IG model) at 300 kPa and 100oC. It is then heated for 1 min by a 200 W resistance heater placed inside the cylinder. The pressure of O2 is maintained constant during the process. Determine (a) the change in stored energy (ΔΦ) and (b) the irreversibility during the process. Assume the surroundings to be at 100 kPa and 25oC. (c) What-if Scenario: What would the answer in part (b) be if the volume were 50 L instead?