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Electron gain enthalpy value for oxygen...

Electron gain enthalpy value for oxygen is negative `( -1 42 kJ` mol `e^(-1))` while sum of electron gain enthaplies of O and `(O^(-))` respectively si positive is `(702kJ "mol"^(-1))` .Explain the reason for opposite sign for two values . Also calcularte `EA_2` value .

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