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Electron Gain Enthalpy

Ionisation en...

Question

Ionisation energy of $F^{-}$ is $320 k J m o l^{- 1}$ . The electron gain enthalpy of fluorine would be:

A

- 320 k J m o l^{- 1}

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B

- 160 k J m o l^{- 1}

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C

+ 320 k J m o l^{- 1}

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D

+ 160 k J m o l^{- 1}

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Solution

The correct option is A $- 320 k J m o l^{- 1}$
Electron gain enthalpy is the opposite of ionisation energy.

$∴ E l e c t r o n G a i n E n t h a l p h y = - I E$

$∴ E G E (F^{-}) = - 320 k J / m o l$

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