10.1 g cao is dropped into a styrofoam coffee cup containing 157 g h2o at 18.0°c. if the following reaction occurs, then what temperature will the water reach, assuming that the cup is a perfect insulator and that the cup absorbs only a negligible amount of heat? [specific heat of water = 4.18 j/g·°c]

cao(s) + h2o(l) → ca(oh)2(s) triangleh^0(subcript rxn) = −64.8 kj/mol

a. 18.02°c b. 35.8°c c. 311°c d. 42.2°c e. 117°c