The electron affinity of oxygen is -141 kJ>mol, corresponding
to the reaction
O1g2 + e-¡O-1g2
The lattice energy of K2O1s2 is 2238 kJ>mol. Use these data
along with data in Appendix C and Figure 7.10 to calculate
the 'second electron affinity' of oxygen, corresponding to
O-1g2 + e-¡O2 -1g2
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