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A solution was prepared by dissolving \( 7.45 \mathrm{~g} \) of \( \mathrm{KCl} \) in \( 200 \mathrm{~g} \) of \( \mathrm{H}_{2} \mathrm{O} \) in a calorimeter with a water equivalent of \( 25 \mathrm{~g} \). The temperature of the water had reduced from \( 28^{\circ} \mathrm{C} \) to \( 25^{\circ} \mathrm{C} \). The value of \( \Delta H \) (in \( \mathrm{kJ} / \mathrm{mol} \) ) for dissolving \( \mathrm{KCl} \) in water is (Specific heat capacity of water is \( 4.2 \mathrm{~J} / \mathrm{K}-\mathrm{g} \) )
(a) \( +2.52 \)
(b) \( +2.835 \)
(c) \( +25.2 \)
(d) \( +28.35 \)
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