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To determine the enthalpy change of a reaction Aim: The object of this practical exercise is to determine the enthalpy change for this reaction by an indirect method based on Hess's law - Calcium carbonate, CaCO3 decomposes with heat. CaCO3(s) CaO(s) + CO2 (g) An enthalpy change ?H is the heat energy exchange with the surrounding at constant pressure. Analysis I performed an experiment of observing the temperature change before and after each of the reactions between CaCO3(s) and HCl and CaO(s) with hydrochloric acid. Equipment and chemicals were provided. My results from my experiment are presented in the table below: Mass of CaCO3(s) + weighing bottle 12.06g Mass of empty weighing bottle 9.59g Mass of CaCO3(s) used 2.47g Temperature of HCl acid initially 24.5 0c Temperature of solution after mixing 25.0 0c Temperature change during reaction -1 0c Mass of CaO(s) + weighing bottle 11.18g Mass of empty weighing bottle 9.59g Mass of CaO(s) used 1.59g Temperature of acid initially 24.5 0c Temperature of solution after mixing...

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