A student find out the enthalpy of NaOH by dissolving 4.00 g of NaOH(s) in 180 mL of pure water (density 0.999 g/mL) at an preliminary temperature of 19.5 °C. Temperature-time data collected subsequent to mixing was extrapolated back to the time of mixing to obtain a temperature change, ΔT = +5.5 °C. The density of the final solution was 1.013 g/ml at 25 °C, as well as the solution heat capacity was 4.08 J/(g °C). In a separate experiment, the calorimeter constant was found to be 21 J/°C.
1.) Explain what is the molar concentration of the final NaOH solution at 25°C?
2.) Define what is the molar enthalpy of dissolution of NaOH in water?