Lattice enthalpy and enthalpy of solution of \( \mathrm{NaCl} \) are \( 788 \mathrm{~kJ} \mathrm...

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Lattice enthalpy and enthalpy of solution of \( \mathrm{NaCl} \) are \( 788 \mathrm{~kJ} \mathrm{~mol}^{-1} \) and \( 4 \mathrm{~kJ} \mathrm{~mol}^{-1} \), respectively. The hydration enthalpy of \( \mathrm{NaCl} \) is
(1) \( 784 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(2) \( -780 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(3) \( 780 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(4) \( -784 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
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