## Chemistry 12th Edition

(a). We can define the molar heat of vaporization as the amount of heat required to vaporize one mole of a liquid. (b). We can define the heat of fusion as the amount of heat required to melt one mole of a solid to liquid. (c). We can define the molar heat of sublimation as the amount of heat that is required to sublime one mole of a solid into gas directly. The units of the above mentioned terms are $\frac{J}{mol}or \frac{KJ}{mol}$.