Question

Calculate the standard enthalpy change for the sublimation of iodine (I2) using the given information: The standard enthalpy of fusion of iodine is 15.52 kJ/mol and the standard enthalpy of vaporization of iodine is 41.57 kJ/mol.

Answer 1

To calculate the standard enthalpy change for the sublimation of iodine  I2 , we need to consider the two processes involved: fusion  melting  and vaporization. Sublimation is the direct transition from solid to gas, so we can add the enthalpy changes for fusion and vaporization to find the enthalpy change for sublimation.Standard enthalpy change for sublimation  H_sub  = Standard enthalpy of fusion  H_fus  + Standard enthalpy of vaporization  H_vap Given:H_fus = 15.52 kJ/molH_vap = 41.57 kJ/molH_sub = 15.52 kJ/mol + 41.57 kJ/molH_sub = 57.09 kJ/molThe standard enthalpy change for the sublimation of iodine  I2  is 57.09 kJ/mol.