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Question:

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

Almost the same as that of the first

Negative, but less negative than the first

A more negative value than the first

A positive value

Solution:

Second electron gain enthalpy is always positive for every element.
O⁻(g) + e⁻ → O²⁻(g); ΔH = positive