3.25 grams of Mg is dropped into 125 mL of hydrochloric acid. The initial temperature of the calorimeter is 18.5°C and the final temperature is 25.6°C. Assume that the heat capacity of the calorimeter is 4.86 J/g°C. Calculate the enthalpy of the reaction.
Mg + HCl -> MgCl2 + H2