Question: A student drops two metallic objects into a 1 2 0 - g steel container holding 1 5 0 g of water at 2 5

A student drops two metallic objects into a 120-g steel container holding 150 g of water at 25C. One object is a 216-g cube of copper that is initially at 94C, and the other is a chunk of aluminum that is initially at 5.0C. To the surprise of the student, the water reaches a final temperature of 25C, precisely where it started. What is the mass of the aluminum chunk?

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