150.0 g of dilute hydrochloric acid is placed in a calorimeter. The temperature of the solution is recorded to be 11.6°C. A piece of magnesium ribbon, with a mass of 0.230 g, is placed in the acid. The final temperature is measured to be 21.5°C. Assume that the hydrochloric acid has the same specific heat capacity as water, 4.184 J/g°C. What is the molar enthalpy of reaction in kJ/mol?