Chapter 21, Problem 76IAE

Would you expect the lattice energy of MgS(s) to be less than, greater than, or about the same as that of MgO(s)? Use appropriate data from various locations in this text to obtain the values of the two lattice energies. Use a value of 456 kJ mol-1 for the process ${\text{S}}^{-}(\text{g})+{\text{e}}^{-}\to {\text{S}}^{2-}(\text{g})$ .