The enthalpy of ionization, also known as ionization energy, is the energy required to remove an electron from a gaseous atom or ion. In this case, we are given the energy required to remove one electron from a gaseous magnesium atom, which is 576 kJ/mol.The enthalpy of ionization of magnesium Mg can be represented as:Mg g Mg g + eThe ionization energy for this process is given as 576 kJ/mol. Therefore, the enthalpy of ionization of magnesium is 576 kJ/mol.