The isolated O2- ion is unstable so it is not possible to
Chapter 9, Problem 141P(choose chapter or problem)
The isolated \(\mathrm{O}^{2-}\) ion is unstable so it is not possible to measure the electron affinity of the \(\mathrm{O}^{-}\) ion directly. Show how you can calculate its value by using the lattice energy of \(\mathrm {MgO}\) and the Born-Haber cycle. [Useful information: \(Mg(s)\rightarrow Mg(g)\ \Delta H^{\circ}=148\mathrm{\ kJ}/\mathrm{mol}\).]
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