A 15-kg iron block initially at 280°C is quenched in an insulated tank that contains 100 kg of water at 18? Assuming the water that vaporizes during the process condenses back in the tank, determine the total entropy change during this process. The specific heat of water at 25 C is cp 4.18 kJ/kg-K. The specific heat of iron at room temperature is cp 0.45 kJ/kg-K. The total entropy change during this process is________kJ/K.

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