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A student drops two metallic objects into a 32 g steel container holding 169 g of water at 29C. One object is a 486 g cube of copper that is initially at 58C, and the other is a chunk of aluminum that is initially at 6.9C. To the student's surprise, the water reaches a final temperature of 29C, precisely where it started.

What was the mass of the aluminum chunk?

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