Lattice enthalpy and enthalpy of solution of

Question:

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. $-780 \mathrm{~kJ} \mathrm{~mol}^{-1}$

  2. $-784 \mathrm{~kJ} \mathrm{~mol}^{-1}$

  3. $780 \mathrm{~kJ} \mathrm{~mol}^{-1}$

  4. $784 \mathrm{~kJ} \mathrm{~mol}^{-1}$


Correct Option: , 2

Solution:

$4=788+\Delta \mathrm{H}$

$\Delta \mathrm{H}=-784 \mathrm{~kJ}$

 

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