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Introduction Calcium Carbonate, CaCO3 decomposes with heat, to produce Calcium Oxide, CaO and Carbon Dioxide, CO2. CaCO3(s) CaO(s) + CO2(g) The object of this practical exercise is to determine the enthalpy change for this reaction by an indirect method based on Hess' Law. Results Table Experiment 1: Mass of CaCO3 and weighing bottle 3.47g Mass of empty weighing bottle 1.08g Mass of CaCO3 used 2.39g Temperature of acid initially 22oC Temperature of solution after mixing 24oC Temperature change during reaction 2oC Experiment 2: Mass of CaO and weighing bottle 2.58g Mass of empty weighing bottle 1.00g Mass of CaO used 1.58g Temperature of acid initially 22oC Temperature of solution after mixing 27oC Temperature change during reaction 5oC Calculating the Enthalpy Change Experiment 1: Calculating the H1 for the reaction between CaCO3 and HCl Using the formula: Density = Mass Volume , We can work out the mass of liquid (HCl) Mass = Density x volume = 2.0 x 0.05 = 0.1 grams Using the calculated mass, we can work out the total energy transfer using the formula: Energy Transfer = Mass of Liquid x specific heat capacity...

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