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Per NCERT §5.5(e), the enthalpy of SOLUTION Δ_sol H° of an ionic compound in water is decomposed as which sum?
AΔ_sol H° = Δ_fusion H° only
BΔ_sol H° = Δ_lattice H° − Δ_hyd H°
CΔ_sol H° = Δ_lattice H° + Δ_hyd H°
DΔ_sol H° = 0 always
Answer & Solution
Correct answer: C. Δ_sol H° = Δ_lattice H° + Δ_hyd H°
Per NCERT §5.5(e), Δ_sol = Δ_lattice + Δ_hyd. For NaCl: +788 + (−784) = +4 kJ/mol (slightly endothermic).
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