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IE₁ of Na → Electron gain enthalpy of Na⁺ = -5.1 eV. In this question, temperature is to be defined as absolute zero. This is due to the fact that ionization energy and electron affinity are defined at absolute zero temperature. Ionization enthalpy = ionization energy + 5/2 RT. Electron gain enthalpy = electron affinity - 5/2 RT.

1. IE₁ of Na → Electron gain enthalpy of Na⁺ = -5.1 eV.
2. Ionization enthalpy = ionization energy + 5/2 RT.
3. Electron gain enthalpy = electron affinity - 5/2 RT.
4. None of the above.

Correct answer: None of the above.

Solution

The question is unclear and does not provide a proper query or options to evaluate. None of the options directly address a specific concept or calculation.

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