Calorimetry By Calibration - Calorimetry By Calibration...

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Calorimetry By Calibration Abstract: The purpose of this lab was to determine the heat of combustion of vegetable oil. The experiment would not be very accurate if only the heat of vegetable oil was determined because there are so many isomers in vegetable oil that the heat of combustion cannot be researched. The heat of combustions of 70% isopropyl alcohol were Gram 1 es Kilocalori 2.71 and Gram 1 es Kilocalori 3.87 . The actual heat of combustion for isopropyl alcohol is Gram 1 es Kilocalori 7.9 . The calibration multiplier, the number that has to be multiplied to the experimental values to get the expected value, is 2.48. The heat of combustions of the vegetable oil with the calibration multiplier were Gram 1 es Kilocalori 14.2 , Gram 1 es Kilocalori 12.9 and Gram 1 es Kilocalori 13.2 . The purpose of the calibration multiplier was to make the results obtained more accurate. The calibration factor used to calculate the heat of combustion for the vegetable oil did not help at all. The use of the number flawed the results even more than when the calibration factor was not used. The conclusion of this lab is that the heat of combustion will always be equal to the products of the mass, heat capacity and the change in temperature or T C M Q × × = . Introduction: The purpose of the experiment was to determine the heat of combustion of vegetable oil using a calibration of the calorimeter and the determination of the heat of
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combustion of 70% isopropyl alcohol. The heat of combustion for this substance is Gram 1 es Kilocalori 7.9 . Calorimetry is the measurement of heat flow and the device used to measure the heat flow is called the calorimeter. The experiment used calorimetry to determine the heat of combustions for the isopropyl alcohol and for the vegetable oil. The heat capacity is the amount of heat energy (joules or kilocalories) needed to heat 1 gram a substance by 1 o C. The higher the heat capacity of a substance the longer it takes to raise its temperature. The heat capacity for water is C 1 Gram 1 calorie 1 ° × . To get an idea on how high that is, the heat capacity of iron is C 1 Gram 1 calorie .11 ° × . The heat capacity of water had to be known to determine the heat of combustion for the alcohol and the oil. Heat of combustion is the amount of energy released when a 1 gram substance is burned. Ultimately, this is the purpose of the experiment; to determine the heat of combustion for vegetable oil. The theory used in this lab was that the heat of combustion will be equal to the products of the mass, heat capacity and the change in temperature or T C M Q × × = . Another theory is that energy cannot be created or destroyed. This comes from the law of conservation of energy. The serving size of the vegetable oil must equal the heat of combustion for it to obey the law of conservation of energy. The purpose of this lab was to find the heat of combustion of vegetable oil. This
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This note was uploaded on 04/14/2008 for the course CHEMISTY 10101 taught by Professor Denofrio during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Calorimetry By Calibration - Calorimetry By Calibration...

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