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Determine the lattice energy of MX2. Consider an ionic compound, MX2, composed of generic metal M...

Determine the lattice energy of MX2. Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X.

  • The enthalpy of formation of MX2 is ΔH∘f=−681 kJ/mol.

  • The enthalpy of sublimation of M is ΔHsub=145 kJ/mol.

  • The first and second ionization energies of M are IE1=607 kJ/mol and IE2=1444 kJ/mol.

  • The electron affinity of X is ΔHEA=−315 kJ/mol.

  • The bond energy of X2 is  BE=247 kJ/mol.

Determine the lattice energy of MX2.

I've been stuck on this question for an hour...and i'm not sure what i'm doing wrong.. Thanks for the help! :)

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