FR expt 6 heat of combustion

FR expt 6 heat of combustion - Mapa Institute of Technology...

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M170L – A31 ent info: ebruary, 2011 [email protected] eat of combustion, bomb calorimeter, aromaticity, pelletizer Mapúa Institute of Technology School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering Heat of Combustion Austria, Meynard 1 Baniqued, Paul Dominick E. 2 1 Professor, School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering, Mapua Institute of Technology; 2 Student, CHM170/A31 Physical Chemistry Laboratory 1, Biological Engineering and Chemistry, Mapua Institute of Technology ABSTRACT The heat of combustion, ΔH, can be measured through a bomb calorimeter. In a constant-volume calorimeter, a sample is pelletized and is ignited by an iron wire in an enclosed system of the instrument. The samples were of benzoic acid, naphthalene and sucrose. The heats of combustion were found to be 6110.85, 9064.65 and 3938.81 in cal/g for each of the samples respectively. The analysis of the molecular structure of the samples found that increasing aromaticity of compounds yield to a higher enthalpy of combustion. Discussion of the relative energies of the bonds broken in combustion had contributed to the overall concept of the experiment. In general, the heat of combustion of a certain compound can be measured in a typical bomb calorimeter and aromaticity is directly proportional to the heat of combustion of a particular compound. INTRODUCTION Calorimetry is the study of measuring the heat, q, evolved or absorbed for a chemical or physical process. If the process occurs at a constant pressure, the heat measured directly is q p . In a constant –volume calorimeter, the heat measured in the the reaction is equal to q and this q is also the internal energy change, ΔU, in this case for there is no work in a constant volume condition.
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This note was uploaded on 04/27/2011 for the course CHM 170 taught by Professor Ng during the Spring '11 term at Mapúa Institute of Technology.

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FR expt 6 heat of combustion - Mapa Institute of Technology...

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