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  • What is the heat of solution of sodium chloride from following data? Hydration energy of <img alt="\mathrm{Na}^{+}=-389.4 \mathrm{~kJ} \mathrm{~mol}^{-1}" src="https://entrancecorner.oncodec

What is the heat of solution of sodium chloride from following data?
Hydration energy of \mathrm{Na}^{+}=-389.4 \mathrm{~kJ} \mathrm{~mol}^{-1}
Hydration energy of \mathrm{Cl}^{-}=-382.3 \mathrm{~kJ} \mathrm{~mol}^{-1}
Lattice energy of \mathrm{NaCl}=-776 \mathrm{~kJ} \mathrm{~mol}^{-1}

Option: 1

+8.6 \mathrm{~kJ} \mathrm{~mol}^{-1}


Option: 2

+4.3 \mathrm{~kJ} \mathrm{~mol}^{-1}


Option: 3

-4.3 \mathrm{~kJ} \mathrm{~mol}^{-1}


Option: 4

-8.6 \mathrm{~kJ} \mathrm{~mol}^{-1}.


Answers (1)

best_answer

Hydration energy of \mathrm{NaCl}=-389.4-382.3 \mathrm{~kJ} / \mathrm{mol}=-771.7 \mathrm{kj} / \mathrm{mol}

\Delta \mathrm{H}_{\text {sol }}= Hydration energy -Lattice energy

=-771.7-(-776) \mathrm{kJ} / \mathrm{mol}
=+4.3 \mathrm{~kJ} / \mathrm{mol}

Posted by

rishi.raj

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