We want here to calculate the Molar Heat of Reaction per mole of water formed in the reaction. In Part 4 above, we calculated that the heat flow was -3.1 kJ for our specific experiment. In Part 5 above, we calculated that the limiting reactant was the NaOH used. Since 0.0475 moles of NaOH reacted completely, from the balanced chemical equation, 0.0475 moles of water must have been produced. The Molar Heat of Reaction per mole of water formed is then given by
Notice that the heat of reaction is a negative number, which means the process is exothermic. The temperature of the calorimeter and the liquid in it increased when the reaction took place as energy was transferred from the reactant substances.