Heat of fusion is the amount of heat required to melt 1 mole of a solid at its melting point.

1)  Calculate the amount of heat necessary to melt 36.0 g of water.  (heat of fusion of H₂O  =  1.44  kcal/mol)

2)  Calculate the heat of fusion of sodium chloride, given the data that 1.16 g of NaCl absorbed 135 cal of heat in changing from a solid to a liquid.

The same amount of heat is given off when a liquid solidifies, as is absorbed when the solid melts.

3) Calculate the amount of heat given off as 10.0 g of liquid sodium solidify. (Heat of fusion of Na  =  0.63 kcal/mole)

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