A. ?Hsolution of NaOH(s) Phase Change: Mass of NaOH: 1.58 g ?T for reaction A : 7 °C A. ?Hsolution of NaOH Phase Change: Calculate the number of moles of NaOH in the Solution. 0.0395 moles Calculate the value (calories) for the heat of solution. -343 cal Calculate the ?Hsolution for sodium hydroxide?