Calculate the enthalpy of solution of potassium chloride if its _L H = 700 kJ mol^ -1 and _ hyd H = -680 kJ mol^ -1

MHT CET 2025 Chemistry question

Calculate the enthalpy of solution of potassium chloride if its kJ mol and kJ mol

(A)20 kJ molCorrect
(B)345 kJ mol
(C)690 kJ mol
(D)1380 kJ mol

Answer: (A)

Solution

Dissolving an ionic solid is imagined as two steps: break the lattice into gaseous ions (lattice enthalpy, endothermic, ) and hydrate the ions (hydration enthalpy, exothermic, ). So

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Question ID VK-102080