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Determining the Enthalpy Change of A Reaction.


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Determining the Enthalpy Change of A Reaction.

... AS CHEMISTRY 2813/2 Coursework Determining the Enthalpy Change of A Reaction. If Calcium Carbonate, CaCO3, is heated it decomposes into Calcium Oxide, CaO and Carbon Dioxide, CO2. CaCO3 CaO + CO2 The aim of this experiment is to determine the enthalpy change of this reaction. To do this I will react both Calcium Carbonate and Calcium Oxide, separately, with 2mol dm-3 Hydrochloric Acid, HCl. By recording the temperature changes in each reaction, and using Hess's Cycle, I will be able to work out the enthalpy change. Hess' Law States: "The enthalpy change for any chemical reaction is independent of the intermediate stages, provided the initial and final conditions are the same for each route." CaCO3 CaO + CO2 CaCl2 + CO2 + H2O In simpler terms, the main point of Hess' Law is that the total enthalpy change for the indirect route of a reaction is the same as the direct route, i.e. ?H1 = ?H2-

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