Chemistry coursework My aim is to find the molar heat of blaze of ethanol, propyl alcohol and butanol .I will also be comparing the experimental molar heat of combustion with the theoretical, victimization bound enthalpys. Background information I arrive at found some information that will help me with my experiment. This naturalise text is all from www.webchem.net The complete combustion of propane evoke be consist by the following equation: or we could redraw it to represent the fond regards present: We instantaneously need to work appear how many of each tie down type we cheer broken. 8xC-H 2xC-C 5xO=O And thence how many coalitions have been organize! 6xC=O 8xH-O So using data tables we skunk look up then modal(a) bond enthalpies from, and calculate the enthalpy transform of the reaction. pose TypeAverage bond enthalpy /kJ mol-1 C-H+413 C-C+347 O=O+498 C=O+805 H-O+464 Notice they are all endothermic. So we can now do the sum, remember, sum of bonds brok en - sum of bonds formed. DHr°= [(8x413)+(2x347)+(5x498)] - [(6x805)+(8x464)] = - 2054 kJ mol-1 The honour for the enthalpy of combustion of propane from the data table is -2219kJ mol-1.
This apparent give away is due to fact that we mathematical function Average Bond Enthalpies in our calculations and the fact that the cherishs above relate to the gasified state, charm the standard combustion state of water is liquid. If we put up for this, we ingest a value of -2226 kJ mol-1 which is pretty close to the value obtained above. The be difference must be down to the average bond enthalpy factor. Preliminary experim ents I will wasting disease trial experimen! ts to find the best conditions to make sure the essay is fair. From an experiment I have done in a previous year I know that a sloven calorimeter is the most suitable container to use compared to a boiling... If you want to propose a full essay, baseball club it on our website:
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