Homework Help: chemistry

Posted by Andrew on Monday, February 15, 2010 at 6:44pm.

How much heat, in kilojoules, is evolved when a 3.70 kg sample of molten Cu freezes?
The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol.

2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d = 8.93 g/cm^3.

chemistry - DrBob222, Monday, February 15, 2010 at 7:33pm
What's the temperature of the molten Cu? I assume it's at the melting point and not above it.
Convert 3.70 kg to moles Cu.
moles Cu x heat fusion = ?? kJ.

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