Consider an ionic compound, MX2, composed of generic metal M and generic halogen

Question

Consider an ionic compound, MX2, composed of generic metal M and generic halogen X. The enthalpy of formation of MX2 is Delta Hf degree = -841 kj/mol. The enthalpy of sublimation of M is Delta H sub =115 kJ/mol. The first and second ionization energies of M are |E1 = 781 kj/mol and |E2 = 1368 kJ/mol. The electron affinity of X is EA - - 339 kj/mol. The bond energy of X2 is BE = 153 kj/mol. Determine the lattice energy of MX2. Use the Born-Haber cycle. It may help to write out the chemical reaction associated with each energy value.

Explanation / Answer

last try

Hf = (enthalpy of sublimation of metal atom) + (bond energy of X2) + (Ionization energies of metal) -

2*(electron affinity of X) + lattice enthalpy

put all values,
lattice enthalpy = -2580 KJ/mol

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