Moles cancel, and we get 9.13 grams of hydrochloric acid. Finally, we use our formula to find the energy change, and we get the total mass ten plus 9.13. So 19.13 grams times 4.18
joules per celsius times gram, which we get from here. And our t final minus t initial so 31 -23 and we get 640 joules. But this corresponds to 00:25 moles of HCL and 00:25 moles of soyu hydroxide. We want to find what corresponds to 1 mol of each.