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Question:

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

+2.55eV

+2.2eV

+10.2eV

-9.1eV

Solution:

The electron gain enthalpy of sodium cation is equal in magnitude and opposite in sign to the first ionization energy of sodium atom. It is equal to -9.1 eV.