Q.

Lattice enthalpy and enthalpy of solution of NaCl are 788 KJmol-1  and 4 KJmol-1  respectively. The hydration enthalpy of NaCl is

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a

-780KJ/mol

b

784 KJ/mol

c

780KJ/mol

d

-784 KJ/mol

answer is C.

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Detailed Solution

ΔHοsol=ΔHLatticeο+ΔHHydο4=788+ΔHHydοΔHHydο=784KJ/mol

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Lattice enthalpy and enthalpy of solution of NaCl are 788 KJmol-1  and 4 KJmol-1  respectively. The hydration enthalpy of NaCl is