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Experiment 1: A3 Bomb Calorimetry

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by Naomi Elman on 24 January 2013

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Transcript of Experiment 1: A3 Bomb Calorimetry

Experiment A3 Introduction Using Bomb Calorimetry to Calculate the Resonance Energy of Benzene Theory: Bomb Calorimetry Bomb Calorimeter. Digital image. Calorimetry. University of Florida, n.d. Web. 20 Jan. 2013. <http://www.chem.ufl.edu/~itl/4411/lectures/lec_9.html>. Theory: Calibration Calibration is necessary to obtain absolute heat flow values

Used benzoic acid to calibrate chemically

Knowing the heat of combustion of benzoic acid allows the calorimeter constant to be calculated Experimental Bomb Calorimetry Results Calculations Summary & Conclusion Experimenter: Naomi Elman Theory
Bomb Calorimetry
Calibration
Examining Benzene
Experimental
Bomb Calorimeter Diagram
Results
C of our calorimeter
Determined Q of CDDT Combustion triggered externally by a voltage source

Fuse wire is touching sample to ensure complete combustion

Combustion occurs because of hot wire and pressure from oxygenated atmosphere Theory: Examining Benzene 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 Discussion Related Research
133.01 kJ/mol (PCCP)
206.91 kJ/mol (Journal of Physical Chemistry)
Physical Chemistry Chemical Physics (Journal)

Three methods of determining Eres of benzene
All yielded consistent results
Conventional
Stoichiometric
GA RERs
Acknowledgments:
Dr. Phelan,
Dr. Kim
Dr. Magde
Ching-Ling Hsu
UCSD: Department of Chemistry and Biochemistry Resonance Energy of Benzene found to be: Calculations
Determining Eres of benzene
Discussion
Comparison to true values
Related Research
Royal Society of Chemistry
References D.R. Burgess, "Thermochemical Data" in NIST Chemistry WebBook, NIST Standard Reference Database Number 69, Eds. P.J. Linstrom and W.G. Mallard, National Institute of Standards and Technology, Gaithersburg MD, 20899, http://webbook.nist.gov, (retrieved January 24, 2013). Mo, Yirong. "The Resonance Energy of Benzene: A Revisit." The Journal of Physical Chemistry A 113.17 (2009): 5163-169. Web of Knowledge. Web. 24 Jan. 2013. Grimme, Stefan, and Ilie Fishtik. "Accurate Evaluation of the Resonance Energies of Benzene and Pyridine via Cyclic Reference State." Physical Chemistry Chemical Physics 14.45 (2012): 15888-5896. Web of Knowledge. Web. 24 Jan. 2013. Halpern, Arthur M. Experimental Physical Chemistry: A Laboratory Textbook. Upper Saddle River, NJ: Prentice Hall, 1997. Print. Physical Chemistry Faculty at UCSD. Chemistry 105A/B Physical Chemistry Laboratory: Supplementary Experimental Methods 2012-2013. La Jolla: Department of Chemistry and Biochemistry, University of California at San Diego, 2012. Print. References 199.6 kJ/mol
(within acceptable range) Error water temperature equilibrium
imperfect adiabatic system
bomb atmosphere not completely oxygen
incomplete combustion of sample
Other experimental values:
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