A student drops two metallic objects into a 120 g steel, Physics

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A student drops two metallic objects into a 120 g steel

A student drops two metallic objects into a 120 g steel container holding 150 g of water at 25°C. One object is a 210 g cube of copper that is initially at 85°C, and the other is a chunk of aluminum that is initially at 5.0°C. To the surprise of the student, the water reaches a final temperature of 25°C, exactly where it started. What is the mass of the aluminum chunk?

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