Question

Second electron gain enthalpy of oxygen is positive while the first is negative?

Answer 1

Answer:

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Explanation:

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see above equations and electron gain enthalpy of O and O- . you observed that ,

electron gain enthalpy of O is negative while electron gain enthalpy of O- is positive .

when an electron is added to Oxygen atom to form O- ion , energy is released . hence, first electron gain enthalpy of oxygen is negative .

But when another electron is add to O- ion to form O2- ion , it feels stronger electrostatic repulsion. hence, when we add 2nd electron , then energy absorb by it. that's why the 2nd electron gain enthalpy of oxygen is positive

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