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The free energy change when 1 mole of Na...

The free energy change when 1 mole of NaCl is dissolved in water at 298 K. is `-x` KJ find out value of 'x' given-
(a) Lattice energy of NaCl `= 778 kJ mol^(-1)`
(b) Hydratin energy of `NaCl = - 775 kJ mol^(-1)`
(c) Enthropy change at `300 K = 40 J mol^(-1)`

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