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? (the specific heat of water = 4.18 J/g°C) CaO(s) + H2O(l) → Ca(OH)2(s) DH°rxn = –64.8 kJ/mol

Possible answers:
A. 35.8 degrees Celsius
B. 18.02 degrees Celsius
C. 311 degrees Celsius
D. 117 degrees Celsius
E. 42.2 degrees Celsius