When a 6.50-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter (Figure 5.18), the temperature rises from 21.6 °C to 37.8 °C. Calculate ¢H (in kJ/mol NaOH) for the solution process
NaOH(s) → Na+(aq) + OH-(aq)
Assume that the specific heat of the solution is the same as that of pure water.