For NaCl_ (s) enthalpy of solution is 4 kJ mol^ -1 and lattice enthalpy is 790 kJ mol^ -1 . What is hydration enthalpy of NaCl?

MHT CET 2023 Chemistry question

For NaCl enthalpy of solution is 4 kJ mol and lattice enthalpy is 790 kJ mol. What is hydration enthalpy of NaCl?

(A)786 kJ
(B)794 kJ
(C)-786 kJCorrect
(D)-794 kJ

Answer: (C)

Solution

Enthalpy of solution is the sum of lattice enthalpy (energy needed to separate the ions of the crystal, +790 kJ mol) and hydration enthalpy of the ions: .

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Question ID VK-094587