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Construct a Born-Haber cycle to calculate the lattice energy of MgCl2. The CRC Handbook of Chemistry...

Construct a Born-Haber cycle to calculate the lattice energy of MgCl2.

The CRC Handbook of Chemistry and Physics lists the MgCl2 lattice energy as 2540 kJ mol-1. How does your answer compare to the literature value?

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Answer #1

Heat of formation of MgCl2 = sublimation of Mg +First Ionization energy of Mg + second ionization energy of Mg +

                                             dissociation of Cl2 + 2 x electron affinity of Cl + Lattice energy fo MgCl2

-641.1 KJ/mol = 150 + 737.7 + 1450.7 + 243 -2(348.57) +Lattice energy of MgCl2

Lattice enrgy = -2525 KJ/mol

Thus we get value of 2525 KJ/mol compared to 2540 KJ/mol

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