Coffee Cup Calorimeter When 6.50 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee cup calorimeter, the temperature rises from 21.6 °C to 37.8 °C Calculate ÎH (in kJ/mol NaOH) for the solution process . NaoH(s) â Assume that the specific heat of the solution is the same as that of pure water. Na+(aq) +OH-(aq) . See example problem p. 202 example 5.7