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You are here: AS and A Level > Chemistry > Organic Chemistry > Comparing the Enthalpy Changes of Combustion of Different Alcohols

Comparing the Enthalpy Changes of Combustion of Different Alcohols

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Submitted:: Thu Jul 11 2002

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Comparing the Enthalpy Changes of Combustion of Different Alcohols

... Comparing the Enthalpy Changes of Combustion of Different Alcohols I am going to perform an investigation with the aim of finding the enthalpy change of combustion (?Hc) of several different alcohols. I will then compare these results and attempt to show how and why the ?Hc of an alcohol varies according to its molecular structure. Planning Equipment apparatus and materials: * Copper calorimeter * Metal draught excluder * Thermometer * Digital scales (capable of mass readings given to at least 2 d.p.) * Clamp stand * Spirit burners containing the alcohols which will be investigated: o Methanol (CH3OH) o Ethanol (C2H5OH) o Propan-1-ol (C3H7OH) o Propan-2-ol (C3H7OH) o Butan-1-ol (C4H9OH) Method Set up apparatus as shown in the diagram Pour 200 cm³ water into the copper calorimeter Take initial temperature reading of water Weigh the spirit burner with the lid on Light spirit burner Stir water often and extinguish the spirit burner once the water temperature has risen by around 20°C Take final temperature of water Weigh the spirit burner with lid Diagram The metal

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"Overall I'm quite impressed by this report. It's well structured and the author demonstrates a good understanding of the topic. A couple of points prevent it from getting a 5-star rating - I would like to see some further consideration of the background theory (e.g. considering enthalpy of bonds broken/formed), as well as some quantitative error analysis. However, the author writes in a very concise manner, recognising for example that it isn't necessary to show every single calculation once one example has been worked fully, and writing the method as a concise list of steps with explanation of how to maintain accuracy as a separate section. TSR User: Illusionary"

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