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A \( 0.05 \mathrm{~L} \) sample of \( 0.2 \mathrm{M} \) aqueous hydrochloric
P acid is added to \( 0.05 \mathrm{~L} \) of \( 0.2 M \) aqueous

W ammonia in a calorimeter. Heat capacity of entire calorimeter system is \( 480 \mathrm{~J} / \mathrm{K} \). The temperature increase is \( 1.09 \mathrm{~K} \). Calculate \( \Delta_{\mathrm{r}} \mathrm{H}^{\circ} \) in \( \mathrm{kJ} / \mathrm{mol} \) for the following reaction:
\[
\mathrm{HCl} \text { (aq.) }+\mathrm{NH}_{3} \text { (aq.) } \rightarrow \mathrm{NH}_{4} \mathrm{Cl} \text { (aq.) }
\]
(1) -52.32
(2) -61.1
(3) -55.8
(4) -58.2
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