Question

Electron gain enthalpy of $F^{-}$ is

• A. -320 KJ mol
• B. -160 KJ mol
• C. +320 KJ mol
• D. 160 KJ mol

Answer 1

The correct option is A

-320 KJ mol

Let's look at this equation.

$F^{-}$ → F + $e^{-}$ $\Delta$H = 320 kJ

F + $e^{-}$ → $F^{-}$

$\Delta$H will be -320 kJ only

Second equation will represent electron gain enthalpy because an electron is added.

Therefore,

Electron gain enthalpy = -320kJ