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Heat of Reaction

If the enthal...

Question

If the enthalpy of formation of $H C l (g)$ and $C l^{-} (a q)$ are $- 90 k J / m o l e$ and $- 170 k J / m o l$ find the enthalpy of solution of hydrogen chloride gas.

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Solution

$\frac{1}{2} H_{2} + \frac{1}{2} C l_{2} ⟶ H C l (g)$
$↑$ $↑$
$H^{+}$ $C l^{-}$
$- 90 + x = - 170$
$\Rightarrow x = - 170 + 90$
$\Rightarrow x = - 80$

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