First slide

Hess law of constant summation

Question

The enthalpies of formation of $HCl, NaOH, NaCl$ and $H_{2} O$ are –120, –82, –148 and –68 K.Cals/mole. respectively. ΔH of the following reaction is $HCl + NaOH \to NaOH + H_{2} O$ is

Moderate

Solution

HCl + NaOH → NaCl + H₂O , ΔH=?
$\begin{array}{l} {\Delta _r}H = \sum {\Delta _f}H(products) - \sum {\Delta _f}H({\mathop{\rm Re}\nolimits} ac\tan ts)\\ \,\,\,\,\,\,\,\,\,\,\, = [ - 148 - 68] - [202]\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 14cal.\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\, \end{array}$

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