The lattice energy of solid is 180 kcal/mol. The dissolution of the solid in water, in the form of ions is endothermic to the extent of 1 kcal/mol. If the solvation energies of Na+ and Cl- ions are in

Question

The lattice energy of solid $NaCl$ is 180 kcal/mol. The dissolution of the solid in water, in the form of ions is endothermic to the extent of 1 kcal/mol. If the solvation energies of Na+ and Cl- ions are in the ratio 6:5, what is the enthalpy of hydration of sodium ion?

Prashant Kotian · Accepted Answer

Correct answer: B. δ H_sol = Lattice + Hydration. +1 = 180 + Hydration => Hydration_total = -179 kcal/mol. Ratio 6:5 => δ H_hyd(Na+) = 6/11 * (-179) = -97.6 kcal/mol.

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