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  4. Enthalpy of sublimation of a substance is equal to

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Q. Enthalpy of sublimation of a substance is equal to

Thermodynamics

Solution:

Solid $\xrightarrow{\text{Sublimation}}$ Vapour
This process occurs in two steps,
Step $1$ : Solid $\xrightarrow{\text{Fusion}}$ Liquid
Step $2$ : Liquid $\xrightarrow{\text{Vaporisation}}$ Vapour
Thus, Enthalpy of sublimation = Enthalpy of fusion + Enthalpy of vaporisation.