Discussion2 - Lauren Taranow Unique 51070 lmt827 Discussion...

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Lauren Taranow lmt827 9-25-11 Unique: 51070 Discussion - Experiment 2: Enthalpy of Chemical Reactions This experiment was designed to teach students how to use a coffee cup calorimeter and Hess’s Law in order to calculate the change in enthalpy of a two-part neutralization reaction. The enthalpy of formation of magnesium oxide can also be calculated using these tools and data from the experiment. In order to calculate the change of enthalpy in reaction 3, each step of reaction 3 was conducted separately to determine its own H rxn . The first and second reactions were performed in a coffee cup calorimeter, with known concentrations and volumes of the solution. The temperature was measured before mixing the chemicals, as well as at 15-second intervals during the reaction, and the initial temperature was subtracted from the maximum temperature to achieve T rxn. The amount of heat released from each reaction was calculated using the equation q=mC T, where C= the specific heat capacity of water. Mass of the solution was calculated by multiplying the volume of the solution by its given density. Once q was calculated for the first two reactions, it was converted from J kJ and the sign of q was made negative for all reactions, which were all exothermic because they released heat from the system to the surroundings, which
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Discussion2 - Lauren Taranow Unique 51070 lmt827 Discussion...

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