The following exothermic reaction occurs in aqueous solution:

Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g) ΔH = -15549.6

A 0.827 g sample of magnesium metal is added to a solution of excess HCl. The solution increases in temperature by 24.8°C. If the mass of the solution is 150. g and the specific heat of the solution is 4.18 J/g°C, calculate the enthalpy change (ΔH) for the equation shown (in joules). Enter your answer without units. The sign of your answer should indicate that heat energy is being released.