Chapter 10, Problem 65E

The quicklime produced in Question $63$ is frequently converted to calcium hydroxide, sometimes called slaked lime, by an exothermic reaction with water: $\text{CaO}\left(\text{s}\right)+{\text{H}}_{\text{2}}\text{O}\left(l\right)\to \text{Ca}{\left(\text{OH}\right)}_{\text{2}}\left(\text{s}\right)+65.3\text{kJ}$. What mass in grams of quicklime was processed in a reaction that transferred $291\text{kJ}$ of energy?