14. \( \mathrm{CaO} \) (s) reacts with water to form \( \mathrm{Ca}(\mathrm{OH})_{2} \) (aq). If \( 6.50 \mathrm{~g} \mathrm{CaO} \) is combined with \( 99.70 \mathrm{~g} \mathrm{H}_{2} \mathrm{O} \) in a coffee cup calorimeter, the temperature of the resulting solution increases from \( 21.7^{\circ} \mathrm{C} \) to \( 43.1^{\circ} \mathrm{C} \). Calculate the enthalpy change for the reaction per mole of \( \mathrm{CaO} \). Assume that the specific heat capacity of the solution is \( 4.18 \mathrm{~J} / \mathrm{g} \cdot \mathrm{K} \). a. \( -1.45 \mathrm{~kJ} / \mathrm{mol} \) b. \( -82.0 \mathrm{~kJ} / \mathrm{mol} \) c. \( -9.42 \mathrm{~kJ} / \mathrm{mol} \) d. \( -165 \mathrm{~kJ} / \mathrm{mol} \) c. \( -532 \mathrm{~kJ} / \mathrm{mol} \)
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The total mass of the solution is the sum of the mass of \( \mathrm{CaO} \) and the mass of \( \mathrm{H}_{2} \mathrm{O} \). Therefore, the total mass is \( 6.50 \, \mathrm{g} + 99.70 \, \mathrm{g} = 106.20 \, \mathrm{g} \). Show more…
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CaO(s) reacts with water to form Ca(OH)2(aq). If 6.50 g CaO is combined with 99.70 g H2O in a coffee cup calorimeter, the temperature of the resulting solution increases from 21.7 °C to 43.1 °C. Calculate the enthalpy change for the reaction per mole of CaO. Assume that the specific heat capacity of the solution is 4.18 J/g·K.
Madhur L.
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