Chapter 9, Problem 9.84SP

When 1.045 g of CaO is added to 50.0 mL of water at 25.0°C in a calorimeter, the temperature of the water increases to 32.3 °C. Assuming that the specific heat of the solution is 4.18 J / (g.&degC)and that the calorimeter itself absorbs a negligible amount of heat, calculate $\Delta H$ in kilojoules/mol $Ca{\left(OH\right)}_2$ for the reaction
$CaO\left(s\right)+H_{2}O\left(l\right)\to Ca{\left(OH\right)}_2\left(aq\right)$