Posted by Andrew on Monday, February 15, 2010 at 7:31pm.
Andrew, I think I answered #1 earlier.
#2.
First calculate the volume of a bar of Cu that is 80 cm x 10 cm x 12 cm.
Volume = Length x width x depth. in cubic centimeters.
mass = density x volume. You have the density and you know the volume, you can calculate mass.
heat to melt = mass x heat of fusion.
Since the heat of fusion is listed in J/mole, you must change the mass of copper to moles from grams. moles = grams/molar mass.
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