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Trend in Ionisation Enthalpy

The reaction,...

Question

The reaction, ${L i}^{+} + F^{-} ⟶ L i F$ is _______ .

A

Exothermic

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B

Endothermic

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C

Adiabatic

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D

None of these

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Solution

The correct option is C Exothermic
In this symbolic expression, gaseous lithium ion and gaseous fluoride ion combine to form a more stable solid. Whenever a reaction goes to a more stable compound, heat is released

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Similar questions

Reaction	Energy charge (in kJ)
$L i (s) ⟶ L i (g)$	$161$
$L i (g) ⟶ {L i}^{+} (g)$	$520$
$\frac{1}{2} F_{2} (g) ⟶ F (g)$	$77$
$F (g) + e^{-} ⟶ F^{-} (g)$	(Electron gain enthalpy)
${L i}^{+} (g) + F^{-} (g) ⟶ L i F (s)$	$- 1047$
$L i (s) + \frac{1}{2} F_{2} (g) ⟶ L i F (s)$	$- 617$

Based on data provided, the value of electron gain enthalpy of fluorine would be

Q. What coefficient is needed for fluorine to balance the following equation?

L i + F_{2} \to L i F

Q. If the observed dipole moment of

L i F

6.32 D

, calculate percentage ionic character; given

L i - F

0.156

Q. The dipole moment of

L i F

was experimentally determined and was found to be

6.32 D

. The percentage ionic character in

L i F

L i - F

0.156

nm. (write the value to the nearest integer)

In LiF, the structure of $F^{-}$ is

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