Heat of Sublimation: K(s) ⟶K(g) ΔH° = 90 kJ
Ionization Energy: K(g) ⟶K+(g) + e− ΔH° = 419 kJ
Heat of Dissociation: F2(g) ⟶2F(g) ΔH° = 159 kJ
Lattice energy: K+(g) + F−(g) ⟶KF(s) ΔH° = −821 kJ
Heat of Formation: K(s) + 1/2F2(g) ⟶KF(s) ΔH° = −569 kJ
Born-Haber cycles were used to obtain the first reliable values for electron affinity by considering the EA value as the unknown and using a theoretically calculated value for the lattice energy. Use a Born-Haber cycle for KF and the following values to calculate a value for the electron affinity of fluorine:
K(s) ⟶K(g) ΔH° = 90 kJ
K(g) ⟶K+(g) + e− ΔH° = 419 kJ
F2(g) ⟶2F(g) ΔH° = 159 kJ
K(s) + 1/2F2(g) ⟶KF(s) ΔH° = −569 kJ
K+(g) + F−(g) ⟶KF(s) ΔH° = −821 kJ
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