Question

Consider an ionic compound, MX2 , composed of generic metal M and generic, gaseous halogen X . The enthalpy of formation of MX2 is Δ𝐻∘f=−677 kJ/mol. The enthalpy of sublimation of M is Δ𝐻sub=161 kJ/mol. The first and second ionization energies of M are IE1=647 kJ/mol and IE2=1377 kJ/mol. The electron affinity of X is Δ𝐻EA=−339 kJ/mol. (Refer to the hint). The bond energy of X2 is BE=221 kJ/mol. Determine the lattice energy of MX2 . Δ𝐻lattice= kJ/mol