Now, the same step, we have to find a molecular weight of hydrochloric acid. Multiplies that by our moles, and we get grams. So 1 gram/mol for h plus 35.5 grams per mole for chlorine, and we get 36.5
grams per mole times zero point 25 moles. 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.