Question

what is the difference between electron gain enthalpy and electron affinity

Answer 1

Electron gain enthalpy is sometimes also referred to as Electron affinity although there is a minute difference between them. Electron gain enthalpy is defined as the amount of energy released when an electron is added to an isolated gaseous atom. ... Positive: When energy is supplied to an atom while adding an electron.

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Answer 2

Electron affinity, a property of an atom in isolated atom should be defined at absolute aero only. This value is positive if energy is released and negative, if energy is utilized.

To find electron gain enthalpy, we need heat capacities of reactant and product.

Electron gain enthalpy is negative if the process of adding electron is exothermic.

Electron gain enthalpy = electron affinity + 2.5RT