A frictionless piston – cylinder device initially contains 1 kg of water at 2 bar and 150 °C. The water then undergoes an isothermal process and the final state is saturated liquid. Assuming that the surrounding air is at 25°C, Determine, a) the heat transfer and work interaction, b) the total entropy change for this process, c) whether this process is reversible, irreversible, or impossible. Explain why

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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.