Magnesium metal reacts with HCl(aq) according to the equation: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
In an experiment to determine the ΔH for this reaction, 0.158 g of Mg metal is combined with an excess of HCl to make 100.0 mL of solution in a coffee cup calorimeter. Upon reaction, the temperature of the solution rises from 25.60 C to 32.80 C. Determine ΔH for the reaction of one mole of Mg. Give your answer in units of kJ to three significant figures. Assume a density of 1.00 g/mL and the specific heat capacity of water for the solution.