![]() ![]() ![]() The Born exponent is typically between 5 and 12. It is a measure of the cohesive forces that bind ionic solids. The Born–Landé equation gives an idea to the lattice energy of a system. In chemistry, the lattice energy is the energy change upon formation of one mole of a crystalline ionic compound from its constituent ions, which are assumed to initially be in the gaseous state. E = − N A M z + z − e 2 4 π ε 0 r 0 ( 1 − 1 n ) Calculated lattice energies The BornLand equation above shows that the lattice energy of a compound. In 1918 Max Born and Alfred Landé proposed that the lattice energy could be derived from the electrostatic potential of the ionic lattice and a repulsive potential energy term. In chemistry, the lattice energy is the energy change upon formation of one mole of a. For NaCl(s), the lattice energy is defined as the enthalpy of the reaction. The beauty of this formula is that it requires no knowledge of the structure of the compound. ![]() The Born–Landé equation is a means of calculating the lattice energy of a crystalline ionic compound. An important enthalpy change is the Lattice Energy, which is the energy required to take one mole of a crystalline solid to ions in the gas phase. In the Kapustinskii formula, the lattice energy (kJ/mol) is given by: (9.5.1) E L 1213.8 z + z n r + + r ( 1 0.345 r + + r ) Here the sum of the monovalent radii is used in place of r o, the bond distance in the Born-Mayer equation. ![]()
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