Enthalpy of sublimation

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Enthalpy of sublimation, or heat of sublimation, is the amount of heat needed to turn one mole of a solid directly into a gas at a given temperature and pressure (usually standard conditions). It reflects the solid’s cohesive energy. For pure metals, it also equals the standard enthalpy of formation of the gaseous metal atoms. The value is typically given in kilojoules per mole (kJ/mol), though it can also be shown in kilojoules per kilogram (kJ/kg).