Question

A chemistry student needs to calculate the heat of sublimation for iodine given that its enthalpy of fusion is 15.52 kJ/mol and its enthalpy of vaporization is 41.57 kJ/mol. The molar mass of iodine is 126.90 g/mol. What is the heat of sublimation for iodine in kJ/mol?

Answer 1

The heat of sublimation is the energy required to convert a substance from its solid phase directly to its gas phase without passing through the liquid phase. In the case of iodine, we are given the enthalpy of fusion  energy required to convert solid to liquid  and the enthalpy of vaporization  energy required to convert liquid to gas . To find the heat of sublimation, we simply add these two values together:Heat of sublimation = Enthalpy of fusion + Enthalpy of vaporizationHeat of sublimation = 15.52 kJ/mol + 41.57 kJ/molHeat of sublimation = 57.09 kJ/molTherefore, the heat of sublimation for iodine is 57.09 kJ/mol.