post lab 2 - Arti Patel Ap29737 Section 51995 Experiment 2...

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Arti Patel, Ap29737 Section: 51995 Experiment 2: Enthalpy of Chemical Reactions - Hess’s Law Discussion/Conclusion Hess’s Law is used to find the measurement of heat in a chemical process. It calculates the enthalpy change between the products and reactants whether it takes one step or several steps. In part 1 of this experiment, this law was used to find the change in enthalpy between ammonia and hydrochloric acid. In part 2, it was used to find the enthalpy change of magnesium oxide. After the reactions and enthalpy changes had been calculated, they were related to the actual enthalpy changes of the reactions to find the percent error in the conducted experiment. To be able to use Hess’s law, first the amount of heat energy made in each reaction had to be calculated. For reaction 3 of the experiment, this was done so by using the formula: q=mC∆T+ (C cal ∆T), where m is the mass of the solution which was found by adding the volumes of both the reactants (.50mL + .50mL) and multiplying by the specific heat of water (4.184 J/gºC)
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This note was uploaded on 09/04/2011 for the course BIOL 1406 taught by Professor Bostic during the Summer '09 term at Austin Community College.

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post lab 2 - Arti Patel Ap29737 Section 51995 Experiment 2...

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