Question

What is the standard enthalpy change for the sublimation of iodine, given that the standard enthalpy of fusion of iodine is 15.2 kJ/mol and the standard enthalpy of vaporization is 41.7 kJ/mol?

Answer 1

The standard enthalpy change for the sublimation of iodine can be calculated by adding the standard enthalpy of fusion and the standard enthalpy of vaporization. This is because sublimation is the process of a solid changing directly into a gas, which involves both fusion  solid to liquid  and vaporization  liquid to gas .Standard enthalpy change for sublimation = Standard enthalpy of fusion + Standard enthalpy of vaporizationStandard enthalpy change for sublimation = 15.2 kJ/mol  fusion  + 41.7 kJ/mol  vaporization Standard enthalpy change for sublimation = 56.9 kJ/mol