Carnot cycle running on a closed system has 1.5 kg of air. The temperature limits are 300

Question:

Carnot cycle running on a closed system has 1.5 kg of air. The temperature limits are 300 K and 1000 K, and the pressure limits are 20 kPa and 1900 kPa. Determine
(a) The efficiency and
(b) The net work output. Use the PG model.
(c) What-if Scenario: How would the answer in part (b) change if the IG model were used instead?