Experiment 9 - Experiment 9 Enthalpy of ReactionHess's Law...

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Experiment 9: Enthalpy of Reaction-Hess’s Law  Taylor MacDonald Partner: Beth McCulloch 11/15/07 Tuesday Section 025 Group 17 Vikas S.
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Introduction: The objective of Experiment 9 was to test the validity Hess’s Law of Constant Heat Summation, examining how well the principle holds for two different chemical reactions. In order to examine Hess’s Law it was also necessary to determine the temperature changes and the enthalpy changes for the series of chemical processes. This experiment was intended to reinforce that if a reaction is carried out in a series of steps, ∆H for the overall process is equal to the sum of the enthalpy changes for the individual steps. That is as long as we start with the reactants in one state and end with the products in another particular state, the overall ∆H rxn is the same, no matter what steps occur in what order. The knowledge of the enthalpy change and calorimetry which was achieved will be able to be applied in future experiments involving heat changes.
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