Zinc metal reacts with hydrochloric acid according to the following balanced equation:
Zn(s) + 2 HCl(aq) ¡ ZnCl2(aq) + H2(g)
When 0.103 g of Zn(s) is combined with enough HCl to make 50.0 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.5 °C to 23.7 °C.
Find ΔrH for this reaction as written. (Use 1.0 g mL-1 for the density of the solution and 4.184 J g-1 °C-1 as the specific heat capacity.)