Question

What is the value of electron gain enthalpy of Na+ if IE1 of Na is 5.1 ev ?

Answer 1

As we know that I.E is the minimum amount of energy required to remove an electron from the valence shell of an isolated gaseous atom in its ground state resulting in the formation of ion whereas, electron gain enthalpy is the amount of energy associated with the gain of electrons by the isolated gaseous atom. So,it is opp. of I.E Hence,if I.E of Na=5.1 its Electron Gain enthalpy will be -5.1
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Answer 2

Answer:

The electron gain enthalpy of Na⁺ is -5.1eV.

Explanation:

Given:

The ionisation enthalpy of Na⁺=5.1 eV

To find:
The electron gain enthalpy of Na⁺=?

• Solution:
  Ionisation enthalpy corresponds to the amount of energy needed in eliminating an electron from an isolated atom in gaseous state.
• Whereas, the amount of energy released on adding an electron to an isolated atom in gaseous state is electron gain enthalpy.
• From the definitions it is evident that both the quantities are opposite of each other.
• Therefore, if IE is 5.1eV, electron gain enthalpy will be -5.1eV.

Thus, the electron gain enthalpy of Na⁺ is -5.1eV.