The second electron gain enthalpies (in kJ m | vedclass

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Question

(D) The first electron gain enthalpy is exothermic,but the second electron gain enthalpy is always endothermic because of the strong electrostatic rep

Vedclass · Accepted Answer

$+780, +590$

Vedclass · Answer

(D) The first electron gain enthalpy is exothermic,but the second electron gain enthalpy is always endothermic because of the strong electrostatic repulsion between the incoming electron and the negatively charged ion. For oxygen $(O^-)$,the second electron gain enthalpy is approximately $+780 \ kJ \ mol^{-1}$. For sulphur $(S^-)$,the second electron gain enthalpy is approximately $+590 \ kJ \ mol^{-1}$. Thus,the values are $+780 \ kJ \ mol^{-1}$ and $+590 \ kJ \ mol^{-1}$ respectively.

The second electron gain enthalpies (in $kJ \ mol^{-1}$) of oxygen and sulphur respectively are

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