The electron affinity of oxygen is -141kJ/mol, corresponding to the reaction
O (g) + e- †’ O- (g)
The lattice energy of K2O(s) is 2238kJ/mol. Use these data along with data in Appendix C and Figure 7.9 to calculate the "second electron affinity" of oxygen, corresponding to the reaction
O- (g) + e- †’ O2- (g)

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