There are many other factors to be considered such as covalent character and electron-electron interactions in ionic solids. Lattice Energy is Related to Crystal Structure The lattice energies for NaCl most often quoted in other texts is about 765 kJ/mol.Ĭompare with the method shown below Na(s) + 0.5 Cl 2(l) ® NaCl(s) Data from various sources differ slightly, and so is the result. The value calculated for U depends on the data used. Hf of NaCl = -411 (Enthalpy of formation) IP of Na(g) = 496 (Ionization potential or energy)ĮA of Cl(g) = -349 (Electron affinity of Cl) Hsub of Na = 108 kJ/mol (Heat of sublimation)ĭ of Cl2 = 244 (Bond dissociation energy)
For a quick review, the following is an example that illustrate the estimate of the energy of crystallization of NaCl.
How is lattice energy estimated using Born-Haber cycle?Įstimating lattice energy using the Born-Haber cycle has been discussed in Ionic Solids.
