When 1.40g of magnesium metal is allowed to react with 200ml of 6.00M aqueous HCl , the temperature rises from 25.0 C to 42.3C . Calculate delta H in kilojoules for the reaction, assuming that the heat capacity of the calorimeter is 776J/C , that the specific heat of the final solution is the same as that of water [(4.18 J/(gxC) ], and that the density of the solution is 1.00g/mL