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3 Cards in this Set
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What is lattice enthalpy ∆HL ? |
Difference in potential energy between ions in solid and gas. |
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Where does Born-Landé equation come from? Write down the equation. |
Born-Landé equation is a mean to calculate the lattice energy of a crystalline ionic compound and is derived from electrostatic potential of the ionic lattice and a repulsive potential energy term.
∆HL (J/mol)= [(ANA |z+z-|e² )/(4πξ0 r)]×(1-1/n)
A = madelung constant NA = Avogadro's constant z+ = charge number of cation z- = charge number of anion e = elementary charge 1.6022 ×10^-19 ξ0 =permittivity of free space r0 =distance to closest ion n = Born potential typically between 5 to 12 |
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