Consider an ionic compound, MX3MX3, composed of generic metal MM and generic gaseous halogen X.X.

• The enthalpy of formation of MX3MX3 is f=877 kJ/mol.Hf=877 kJ/mol.

• The enthalpy of sublimation of MM is sub=147 kJ/mol.Hsub=147 kJ/mol.

• The first, second, and third ionization energies of MM are IE1=639 kJ/mol,IE1=639 kJ/mol, IE2=1717 kJ/mol,IE2=1717 kJ/mol, and IE3=2621 kJ/molIE3=2621 kJ/mol.

• The electron affinity of XX is EA=345 kJ/molHEA=345 kJ/mol. (Refer to the hint).

• The bond energy of X2X2 is BE=177 kJ/mol.BE=177 kJ/mol.

Determine the lattice energy of MX3.