A Carnot engine has 2 kg of air as the working fluid. Heat is supplied to the air at 1000oC and rejected by the air at 400 oC. At the beginning of the heat addition process, the pressure is 0.9 MPa and during heat addition the volume double. Calculate the net cycle work assuming air is an ideal gas with constant specific heats. Calculate the amount of work done in the isentropic expansion process. Calculate the entropy change during the heat rejection process.

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.