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Q.

Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ  mol-1 and 4 kJ mol-1, respectively. The hydration enthalpy of NaCl is :

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a

784 kJ  mol-1

b

780 kJ  mol-1

c

-784 kJ   mol-1

d

-780 kJ   mol-1

answer is C.

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Detailed Solution

ΔHsolution =ΔHrattice +ΔHhydration ΔHhydration =ΔHsolution −ΔHlattice =4kJ−788kJ=−784kJ/mole
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Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ  mol-1 and 4 kJ mol-1, respectively. The hydration enthalpy of NaCl is :