A 480-g iron pan is heated on a stove to a temperature of 130° C. The pan is then dropped into a partially-filled sink of water at 20° C. The final temperature reached by the sink and the pan is 40° C. How much water was in the sink? Give your answer in kilograms. The specific heat of iron is 449 J/(kg C) and the specific heat of water is 4190 (J/(kg.C).

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