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Emma Powditch 12RP Chemistry Coursework Comparison of Enthalpy Changes of Combustion of Different Alcohols Aim: To investigate how and why the enthalpy of combustion of varying alcohols is affected by molecular structure. The enthalpy change of combustion refers to the amount of energy transferred when one mole of fuel burns completely. This value was obtained by using various fuels to heat water, knowing 4.2J of energy are required to raise the temp of 1g of water by 1oC, using the following method. The enthalpy change of one mole of alcohol can be calculated from the amount of energy the water has absorbed. Apparatus Fuel burners and the following alcohols Methanol (CH3OH) Ethanol (C2H5OH) Propan-1-ol (C3H7OH) Butan-1-ol (C4H9OH) Octan-1-ol (C8H17OH) Copper Calorimeter Thermometer 250cm3 measuring cylinder Goggles Draft excluder Electronic scales (to 3dp for accuracy purposes) Stirring rod Diagram Method 1. Pour 200cm3 of water into a copper calorimeter and record the temperature. 2. Using a clamp stand support the calorimeter over your chosen spirit burner. (At this point it is useful...

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