일반물리학 1 — Entropy and the Second Law of Thermodynamics: Problem 33

33 A mixture of 1773 g of water and 513 g of ice is in an initial equilibrium state at $0.000^\circ\text{C}$. The mixture is then, in a reversible process, brought to a second equilibrium state where the water–ice ratio, by mass, is 1.00:1.00 at $0.000^\circ\text{C}$. (a) Calculate the entropy change of the system during this process. (The heat of fusion for water is 333 kJ/kg.) (b) The system is then returned to the initial equilibrium state in an irreversible process (say, by using a Bunsen burner). Calculate the entropy change of the system during this process. (c) Are your answers consistent with the second law of thermodynamics?