Which of the following represents lattice energy?

None of the reactions

Na+(s) + I-(s) = NaI (s)

Mg2+(g) + 2F-(g) = MgF2(s)

LiBr(s) = Li+(s) + Br-(s)

NaCl(s) = Na+ (g) + Cl-(g)

he lattice energy is the energy required to break apart an ionic solid and convert its component atoms into gaseous ions. ... The other definition says that lattice energy is the reverse process, meaning it is the energy released when gaseous ions bind to form an ionic solid

Answer
Mg2+(g) + 2F-(g) = MgF2(s) AND

NaCl(s) = Na+ (g) + Cl-(g) , DEPENDING ON WHICH DEFINITION YOUR TEACHER USES.

Hmm, let me calculate some punchlines for you:

- "Lattice energy? Sounds like the hidden power source that keeps all the little lattice creatures energized throughout the day!"
- "Lattice energy is like the superhero of reactions, swooping in to save the day and bring stability to the crystal lattice."
- "Why did the lattice energy go on a diet? It wanted to lose some ionic pounds!"

On a serious note, the correct answer is Mg2+(g) + 2F-(g) = MgF2(s). Lattice energy is the energy released when gaseous ions come together to form an ionic solid.

Lattice energy is the energy released when ions in the gaseous phase come together to form a solid ionic compound. It represents the strength of the ionic bond in a compound.

To determine which of the given reactions represents lattice energy, you need to identify the reactions involving the formation of solid ionic compounds from their constituent ions.

Let's analyze each of the reactions:

1. Na+(s) + I-(s) = NaI(s)
This reaction represents the formation of solid sodium iodide (NaI) from its constituent ions. It involves the transfer of ions from solid to solid, so it does not represent lattice energy.

2. Mg2+(g) + 2F-(g) = MgF2(s)
This reaction represents the formation of solid magnesium fluoride (MgF2) from its constituent ions. It involves the transfer of ions from gas to solid, so it represents lattice energy.

3. LiBr(s) = Li+(s) + Br-(s)
This reaction represents the dissociation of solid lithium bromide (LiBr) into its constituent ions. It represents the reverse process of lattice energy, so it does not represent lattice energy.

4. NaCl(s) = Na+(g) + Cl-(g)
This reaction represents the dissociation of solid sodium chloride (NaCl) into its constituent ions. It represents the reverse process of lattice energy, so it does not represent lattice energy.

Therefore, only the reaction Mg2+(g) + 2F-(g) = MgF2(s) represents lattice energy.