I have drawn this cycle very roughly to scale, but that is going to become more and more difficult as we look at the other two possible formulae. Lattice H denotes the molar lattice enthalpy. Where: LatticeU denotes the molar lattice energy. So the compound MgCl is definitely energetically more stable than its elements. The molar lattice energy of an ionic crystal can be expressed in terms of molar lattice enthalpy, pressure, and change in volume via the following equation: LatticeU LatticeH pVm. Thus, we can say that the lattice dissociation enthalpy is 788 kJ/mol and the lattice formation enthalpy is -788 kJ/mol.
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