Use the Born Haber cycle and the information provided to determine the lattice energy of $MgC{l}_2($s$).$

$Mg(s)+C{l}_2(g)MgC{l}_2(s)$

$H_f(MgC{l}_2)=-642k\frac{J}{m}ol$

$H_{\text{s}\text{u}\text{b}}(Mg)=146k\frac{J}{m}ol$

first ionization energy of $Cl=737\mathrm{.}7k\frac{J}{m}ol$

second ionization energy of $Cl=1451k\frac{J}{m}ol$

Bond energy of $C{l}_2=243\mathrm{.}4k\frac{J}{m}ol$

electron affinity of $Cl=-349k\frac{J}{m}ol$

$-2578\mathrm{.}1$

$-2522\mathrm{.}1$

$-2871\mathrm{.}3$

$-2334\mathrm{.}7$