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When the first electron gain enthalpy (ΔegH) of oxygen is -141 kJ/mol, its second electron gain enthalpy is:

1. a positive value
2. a more negative value than the first
3. almost the same as that of the first
4. negative, but less negative than the first

Correct answer: a positive value

Solution

Adding a second electron to the already negative O- ion requires energy to overcome electron-electron repulsion, so the second electron gain enthalpy of oxygen is positive (endothermic).

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