7. Which of the following is an example of lattice energy? (3 points)
(A) \(\mathrm{M}^{+n}(\mathrm{g}) + n\mathrm{X}^{-}(\mathrm{g})\longrightarrow \mathrm{MX}_{n}(\mathrm{g})\)
(B) \(\mathrm{M}^{+n}(\mathrm{g}) + n\mathrm{X}^{-}(\mathrm{g})\longrightarrow \mathrm{MX}_{n}(\mathrm{s})\)
(C) \(\mathrm{MX}_n(\mathbf{s})\longrightarrow \mathrm{M}^{+n}(\mathbf{g}) + n\mathrm{X}^{-}(\mathbf{g})\)
(D) \(\mathrm{MX}_n(\mathbf{g})\longrightarrow \mathrm{M}^{+n}(\mathbf{g}) + n\mathrm{X}^{-}(\mathbf{g})\)
(E) \(M(s) + n / 2X_{2}(g)\longrightarrow MX_{n}(s)\)

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