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The object of this investigation is to determine the enthalpy change for the reaction CaCO3 (s) → CaO (s) + CO2 (g) by an indirect method based on Hess’ Law. Hess’s law states that the enthalpy change for any chemical reaction
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Determining the Enthalpy Change of a Reaction Introduction The object of this investigation is to determine the enthalpy change for the reaction CaCO3 (s) › CaO (s) + CO2 (g) by an indirect method based on Hess' Law. Hess's law states that the enthalpy change for any chemical reaction is independent of the route taken provided that the initial and final conditions are identical. So the temperature change during these reactions below can be measured and the enthalpy changes ?H1 and ?H2 calculated. For Example: Using Hess' law with the calculated values for ?H1 and ?H2 it is possible to calculate a value for ?H3. Results Table Mass of CaCO3 + weighing bottle 3.43 g 3.46 g 3.43 g Mass of empty weighing bottle 0.92 g 0.93 g 0.93 g Mass of CaCO3 used 2.51 g 2.53 g 2.50 g Temperature change of acid initially 21 ?C 22 ?C 22 ?C Temperature of acid after mixing 24 ?C 25 ?C 24 ?C Temperature change during reaction 3 ?C 3 ?C 2 ?C Mass of CaO +...
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