The enthalpy of sublimation of a substance is equal to:
1. Enthalpy of fusion + Enthalpy of vaporization
2. Enthalpy of fusion
3. Enthalpy of vaporization
4. Twice the enthalpy of vaporization
Hint: Sublimation reaction in which solid substance directly convert into gas formed.
Step 1:
Sublimation process is a direct conversion of solid to vapour ; solidvapour
Standard enthalpy of sublimation is the change in enthalpy when one mole of a solid substance sublimes at a
constant temperature and under standard pressure (1bar).
Step 2:
The sublimation process occurs in two steps, we have solidliquidvapour
solidliquid requires enthalpy of fusion and liquidvapour requires enthalpy of vaporization.
Hence, Enthalpy of sublimation of a substance is equal to Enthalpy of fusion + Enthalpy of vaporization
