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Enthalpy

The lattice e...

Question

The lattice energy of $N a C l (s)$ is $- 790 k J . {m o l}^{- 1}$ and enthalpy of hydration is $- 785 k J . {m o l}^{- 1}$ . Calculate the enthalpy of the solution of $N a C l (s)$ .

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Solution

Enthalpy of solution $=$ Enthalpy of hydration $-$ Lattice energy of NaCl(s)

$= - 785 - (- 790) = 5 k J / m o l$

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