A 50-g cube of ice, initially at 0.0°C, is dropped into 200 g of water in an 80-g aluminum container, both initially at 30°C. What is the final equilibrium temperature in Kelvin? (Specific heat for aluminum is 900 J/kg×C°, the specific heat of water is 4 186 J/kg×C°, and Lf = 3.33×10 5 J/kg.

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