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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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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.