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Answer :
The correct reaction associated with the lattice energy of SrSe (ΔH°latt) is Sr2+(g) + Se2-(g) → SrSe(s).
What is lattice energy?
Lattice energy refers to the energy released when gaseous ions are combined to form an ionic solid. It is calculated using Coulomb's law, which calculates the attractive force between the oppositely charged ions in the solid. It is expressed in kJ/mol and is a measure of the strength of the ionic bonds present in the solid. What is the reaction associated with lattice energy? The lattice energy of an ionic compound can be determined using the Born-Haber cycle, which shows the enthalpy changes associated with the formation of the solid from its constituent elements. In the case of SrSe, the following reaction is associated with the lattice energy of SrSe (ΔH°latt): Sr2+(g) + Se2-(g) → SrSe(s)The above reaction shows the formation of the ionic solid SrSe from its constituent ions. The lattice energy can be calculated using Hess's law and the enthalpies of formation of the reactants and products.
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Final answer:
The lattice energy of SrSe is associated with the reaction Sr²⁺(g) + Se²⁻(g) → SrSe(s). Understanding lattice energy requires an understanding of Coulomb's law, which indicates that smaller and more highly charged ions yield higher lattice energies. This concept applies to a range of compounds, including caesium fluoride (CsF).
Explanation:
The reaction associated with the lattice energy of SrSe (ΔH°latt) is Sr²⁺(g) + Se²⁻(g) → SrSe(s). Lattice energy is the energy required to separate one mole of a compound into its gas phase. The lattice energy can be expressed by the formula C(Z⁺) (Z⁻) Ro, derived from Coulomb's law, which governs the forces between electric charges. Simply put, it’s the energy required to break the ionic bonds of a crystal lattice.
In general, smaller and more highly charged ions will have higher lattice energies due to stronger Columbia attraction. It means that if the O²⁻ ion is smaller than the Se²⁻ion, then Al₂O3 would have a shorter interionic distance than Al2Se₃, resulting in Al₂O₃ having a larger lattice energy. This principle also applies to other compounds like caesium fluoride (CsF).
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