The standard enthalpy change for the sublimation of iodine I2 at 25C 298 K and 1 atm can be found in reference tables or calculated from the standard enthalpies of formation for the solid and gaseous states of iodine.From reference tables, the standard enthalpy change for the sublimation of iodine at 298 K is approximately 62.44 kJ/mol. This value represents the energy required to convert 1 mole of solid iodine to gaseous iodine under standard conditions 25C and 1 atm .