Chapter 12, Problem 87E

Refer to Example 12-12. Together with data given there, use the data here to calculate ${\Delta }_{r}H°$ for 1 mol ${\text{MgCl}}_{\text{2}}$ (s). Explain why you would expect ${\text{MgCl}}_{\text{2}}$ to be a much more stable compound than MgCl. (The second ionization energy of Mg is 1451 kJ mol-1; the lattice energy of ${\text{MgCl}}_{\text{2}}$ (s) is -2526 kJ mol-1 ${\text{MgCl}}_{\text{2}}$ .)