Respuesta :
The correct Lattice Energy of CaF₂ is the energy change given by;
Option A; Ca²⁺ (s) + 2F⁻ (g) → CaF₂
In chemistry, Lattice energy is defined as the energy required to dissociate one mole of an ionic compound to its constituent gaseous ions.
This means that lattice energy deals with the ions of an ionic compound in their isolated gaseous states. This means that the correct chemical equation process that shows the lattice energy for CaF₂ will be the one that shows the ions attached to the reaction side.
Looking at the given options, the only one that shows the correct ions attached to the reaction side is;
Option A; Ca²⁺ (s) + 2F⁻ (g) → CaF₂
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The lattice energy of CaF₂ is the energy change for none of the choices presented.
The lattice energy is the energy required to dissociate one mole of an ionic compound to its constituent ions in the gaseous state.
Let's consider which of the following processes represents the energy change for the lattice energy.
A. Ca²⁺(s) + 2 F⁻(g) → CaF₂(g)
This is the association of ions rather than the dissociation, so it doesn't represent the lattice energy.
B. CaF₂(g) → CaF₂(s)
This process is known as deposition and the associated energy as enthalpy of deposition.
C. Ca(g) + 2 F(g) → CaF₂(s)
This process is the formation of CaF₂ and does not respond to the definition of lattice energy.
D. CaF₂(aq) → CaF₂(s)
This process is the crystallization of CaF₂ and does not respond to the definition of lattice energy.
E. none of these choices is correct.
None of the options is correct. The right option would be:
CaF₂(s) ⇒ Ca²⁺(g) + 2 F⁻(g)
The lattice energy of CaF₂ is the energy change for none of the choices presented.
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