Question

Calculate the heat of sublimation of solid carbon dioxide (dry ice) given that the enthalpy of fusion of solid carbon dioxide is 8.6 kJ/mol and the enthalpy of vaporization of carbon dioxide gas is 22.8 kJ/mol. (Hint: The heat of sublimation of a substance is equal to the sum of its enthalpy of fusion and enthalpy of vaporization.)

Answer 1

To calculate the heat of sublimation of solid carbon dioxide  dry ice , we need to add the enthalpy of fusion and the enthalpy of vaporization.Enthalpy of fusion = 8.6 kJ/molEnthalpy of vaporization = 22.8 kJ/molHeat of sublimation = Enthalpy of fusion + Enthalpy of vaporizationHeat of sublimation = 8.6 kJ/mol + 22.8 kJ/molHeat of sublimation = 31.4 kJ/molTherefore, the heat of sublimation of solid carbon dioxide  dry ice  is 31.4 kJ/mol.