Consider an ionic compound, MX, composed of generic metal M and generic, gaseous halogen X.

The enthalpy of formation of MX is ΔHf° = –577 kJ/mol.
The enthalpy of sublimation of M is ΔHsub = 159 kJ/mol.
The ionization energy of M is IE = 413 kJ/mol.
The electron affinity of X is ΔHEA = –325 kJ/mol. (Refer to the hint).
The bond energy of X2 is BE = 211 kJ/mol.

Determine the lattice energy of MX.

ΔH lattice= _____ Kj/mol

Question

Consider an ionic compound, MX, composed of generic metal M and generic, gaseous halogen X.

The enthalpy of formation of MX is ΔHf° = –577 kJ/mol.
 The enthalpy of sublimation of M is ΔHsub = 159 kJ/mol.
 The ionization energy of M is IE = 413 kJ/mol.
 The electron affinity of X is ΔHEA = –325 kJ/mol. (Refer to the hint). 
The bond energy of X2 is BE = 211 kJ/mol.

Determine the lattice energy of MX.

ΔH lattice= _____ Kj/mol

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