The standard enthalpy change for the sublimation of solid iodine I2 into gaseous iodine atoms I can be calculated using the following steps:1. Determine the standard enthalpy change for the dissociation of one mole of I2 into two moles of I atoms:I2 g 2I g ; H_dissociation = 151 kJ/mol2. Determine the standard enthalpy change for the sublimation of one mole of I2 from solid to gas:I2 s I2 g ; H_sublimation = 62 kJ/mol3. Combine the two enthalpy changes to find the overall standard enthalpy change for the sublimation of solid iodine into gaseous iodine atoms:H_total = H_sublimation + 0.5 * H_dissociationH_total = 62 kJ/mol + 0.5 * 151 kJ/molH_total = 62 kJ/mol + 75.5 kJ/molH_total = 137.5 kJ/molThe standard enthalpy change for the sublimation of solid iodine into gaseous iodine atoms is 137.5 kJ/mol.