Steam undergoes an adiabatic expansion in a piston-cylinder assembly from 30 bar, 360°C to 3 bar, 240° C. What is work in kJ per kg of steam for the process?  Calculate the amount of entropy produced, in kJ/K per kg of steam.  What is the maximum theoretical work that could be obtained from the given initial state to the same final pressure?

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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.