Draw a Born-Haber cycle for aluminium oxide.

For the given pair of compounds, suggest which will have the most exothermic lattice energy?

${\mathrm{MgI}}_2$ and ${\mathrm{SrI}}_2$

Calculate the enthalpy of hydration of magnesium ions given that:
$$\begin{gathered} ∆{\mathrm{H}}_{\mathrm{latt}}^{⊝} \left[{\mathrm{MgCl}}_2\right] =-2592 \mathrm{kJ} {\mathrm{mol}}^{-1} \\ ∆{\mathrm{H}}_{\mathrm{sol}}^{⊝} \left[{\mathrm{MgCl}}_2\right]=-55 \mathrm{kJ} {\mathrm{mol}}^{-1} \\ ∆{\mathrm{H}}_{\mathrm{hyd}}^{⊝} \left[{\mathrm{Cl}}^{-}\right]=-364 \mathrm{kJ} {\mathrm{mol}}^{-1} \end{gathered}$$

(Give the value only)

Define the term enthalpy change of atomisation.

Explain why the lattice energy of sodium chloride has a value that is lower than the lattice energy of lithium chloride.