Answer:
Eqn. (ii) - Eqn. (i) gives
\[{{O}^{-}}(g)+{{e}^{-}}\,\xrightarrow{\,}\,{{O}^{2-}},\]\[\Delta H=712\,-(-142)kJ\,mo{{l}^{-1}}=854\,kJ\,mo{{l}^{-1}}\].
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