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The enthalpy of solution of sodium chlor...

The enthalpy of solution of sodium chloride is `4 kj mol^-1` and its enthalpy of hydration of ions is `-784 kJ mol^-1` .Then the lattice enthalpy of NaCl (in kJ `mol^-1`) is
(1) `+788`
(2) `+4`
(3) `+398`
(4) `+780`
`+394`

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