molar heat of fusion of sodium metal is 2.60kJ/mol, whereas its heac of vaporizs. an is 97kJ/mol. a. Why is the heat of vaporization so much larger than the heat of fusion? Since conversion from a liquid to a gas breaki many more intermoiecular forces than conversion from a solid to a liquid, it requires much more energy. Since conversion from a solid to a liquid hycaks many more intermolecular forces than conversion from a liquid to a gas, it requires much less energy: Since conversion from a solid to a liquid breaks many more intermolecular forces than conversion from a liquid to a gas, it requires much mere energy. since conversion from a liquid to a gas breaks many more interinolecular forces than conversian from a solid to a liquid, it requires much less energy. b. What quantity of heat would be needed to meit 1.00g sodium at its normal meiting point? Heat= What quantity of heat would be needed to vaporize 1.00g sodium at its normal boiling point? Heat=, What quantity of heat would be evolved if 1.00g sodium vapor condensed at its normal boiling point? Heat=