Question

The ionization energy of $F^{-}$ is 320 kJ/mole. The electron gain enthalpy of fluorine would be?

• A. -320 kJ/mole
• B. -160 kJ/mole
• C. 320 kJ/mole
• D. 160 kJ/mole

Answer 1

The correct option is A

-320 kJ/mole

Ionization enthalpy is exactly opposite to electron gain enthalpy in this case. If you are talking about ionization enthalpy of F and electron gain enthalpy of F, then we can't say the same thing.

$F^{-}⟶$ F + $e^{-}$ $\Delta H=320kJ/mole(I.E)$

$F+e^{-}⟶$ $F^{-}$ $\Delta H=-320kJ/mole(I.E)$