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Unformatted text preview: sodium cations and chloride anions, and repulsive interactions between sodium cations and between chloride anions. For a mole of solid NaCl, the sum of all these Coulombic energies for all cations and anions in a crystal is -861 kJ/mole. Na + (g) + Cl-(g) NaCl → (s) U = -861 kJ/mole Δ Lattice Energy- change in energy when completely gaseous atoms are brought together into 1 mole of a solid ionic substance. As we see from Coulomb's law, the lattice energy is related to the charge and distance between ions in the solid. Smaller the ions will have smaller distances between them in a solid, and thus have higher lattice energies....
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- Fall '10
- Chemistry, sodium ions, chloride ions, crystalline sodium chloride