10. In an experiment, \( 50.0 \mathrm{~cm}^{3} \) of \( 1.0 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}(\mathrm{aq}) \) reacts with \( 50.0 \mathrm{~cm}^{3} \) of \( 1.0 \mathrm{~mol} \mathrm{dm} \mathrm{dm}^{-3} \mathrm{NaOH}(\mathrm{aq}) \).The energy released \( =2500 \mathrm{~J} \). The specific heat capacity of the mixture is \( 4.18 \mathrm{Jg}^{-1}{ }^{\circ} \mathrm{C}^{-1} \). What temperature change occurs in the reaction? Assume the density of the resulting mixture is equal to that of water at \( 20^{\circ} \mathrm{C}\left(\mathrm{d}=1.0 \mathrm{~g} \mathrm{~cm}^{-3}\right) \). \( \begin{array}{ll}\text { A. An increase of } 6.0^{\circ} \mathrm{C} & \text { B. A decrease of } 6.0^{\circ} \mathrm{C} \\ \text { C. An increase of } 12.0^{\circ} \mathrm{C} & \text { D. A decrease of } 12.0^{\circ} \mathrm{C}\end{array} \)
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