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Q.

How is the enthalpy of vaporization of a substance related to its enthalpy of fusion?

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a

The enthalpy of vaporization is greater than the enthalpy of fusion.

b

The enthalpy of vaporization is equal to the enthalpy of fusion.

c

The enthalpy of vaporization is less than the enthalpy of fusion.

d

There is no general relationship between a substance's enthalpy of vaporization and enthalpy of fusion.

answer is A.

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Detailed Solution

The first is that a substance's enthalpy of vaporization is always greater than its enthalpy of fusion. The molecules are not nearly as separated from one another when a solid melts as they are when a liquid boils.

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How is the enthalpy of vaporization of a substance related to its enthalpy of fusion?