MetE 206 Exp6 - MetE 206 Material Laboratory Experiment VI...

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MetE 206 Material Laboratory Experiment VI Temperature Measurement Lab Assistant Volkan Kalem Tahir Mahmut Beydola 1394014
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Objective This experiment is to conduct heat of combustion measurement tests in order to demonstrate the use of a bomb calorimeter. Apparatus: - Parr. 1341 Oxygen Bomb Calorimeter Unit -Ignition Unit -Oxygen Tank -Computer -Data acquisition system -Thermometer -Ignition Wire Sample Used Coke powder (0.8% S + 1.1% H 2 O + ?% Ash + ?% C) + Active coke. Ignition wire (2.3cal/cm) was taken to calorimeter 9.9 cm but 6.1 cm was used. Theory Processes that results in heat being generated and exchanged with the environment is in the calorimetric study. In order to measure the heat of reactions, we enclose the reactants in a calorimeter, initiate the reaction and measure the temperature difference before and after the reaction. The temperature difference enables us to evaluate the heat released by the reaction. There are two types of calorimeters isoperibol and the bomb calorimeters. They sectioned by their working principles. The bomb calorimeters are used for the reactions that take place under constant pressure. Therefore, it can be harmful if we can not control the calorimeter, explosions can occur. The isoperibol calorimeter is simpler, it work constant volume principle. Experiment We put coke powder with active coke inside the calorimeter. Then the ignition wire with touching the coke. The oxygen pumped into it until 20 atm pressure was satisfied. Q = WΔT = Qwire + Qc.p We can easily evaluate the ΔH of the material that is asked. We know the water equivalent of the calorimeter and the content of the coke powder and Qwire so we can easily calculate the heat of formation of CO 2 . And the pressure at which the reaction takes place does not affect the results.
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Results Q = Q carbon + Q sulphur + Q water + Q wire ΔH C (s) + O 2 (g) CO 2 (g) (at 20 atm) ΔH 1 ΔH 2 ΔH 3 C (s) + O 2 (g) CO 2 (g) (at 1 atm)
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MetE 206 Exp6 - MetE 206 Material Laboratory Experiment VI...

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