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The lattice energy of solid NaCl is 180 kcal mol⁻¹. The dissolution of the solid in water in the form of ions is endothermic to the extent of 1 kcal mol⁻¹. If the hydration energies of Na⁺ and Cl⁻ ions are in the ratio 6 : 5, what is the enthalpy of hydration of sodium ion?
A
−85.6 kcal/mol
B
−97.5 kcal/mol
C
82.6 kcal/mol
D
+100 kcal/mol
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