DiazJ_Exp9

DiazJ_Exp9 - Experiment 9: Calorimetry and Hesss Law...

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Experiment 9: Calorimetry and Hess’s Law 10-2-11 Joel Diaz 11-10-11 Amber Tra Chemistry 1045L-25 Ryan Riskowski
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Purpose The purpose of this experiment is to demonstrate the concept of Hess’s Law by using calorimetry. The calorimeter is used to determine the enthalpy of two reactions. The reaction of Mg in HCl and MgO in HCl is used. Procedure The first part of the experiment consists of determining the heat capacity of the calorimeter; this is done by testing the calorimeter by using it on the mixture of hot and cold water. The second part of the experiment consists of determining the heat of reaction of Mg in HCl. The same thing is done to MgO in HCl in the third part of the experiment. Data Table 1. Trial 1 Trial 2 Volume of Cold Water 50 mL 50 mL Temperature of Cold Water 21.0 C 22.0 C Volume of Hot Water 50 mL 50 mL Temperature of Hot Water 49.0 C 51.0 C Table 2. Description of Sample Four slim metallic strips Volume of HCl 100 mL Temperature of HCl 23.0 C Exact Mass of Mg 0.198 g
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DiazJ_Exp9 - Experiment 9: Calorimetry and Hesss Law...

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