Consider an ionic compound, MX2 , composed of generic metal M and generic, gaseous halogen X .
The enthalpy of formation of MX2 is Δ𝐻∘f=−753 kJ/mol.
The enthalpy of sublimation of M is Δ𝐻sub=139 kJ/mol.
The first and second ionization energies of M are IE1=793 kJ/mol and IE2=1417 kJ/mol.
The electron affinity of X is Δ𝐻EA=−341 kJ/mol. (Refer to the hint).
The bond energy of X2 is BE=207 kJ/mol.
Determine the lattice energy of MX2