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.