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Chemistry coursework The energy released when different alcohols are burned Experimental results for the combustion of alcohols Methanol Ethanol Propanol Butanol Mass of spirit lamp & fuel at start 175.89 188.33 179.67 166.54 Mass of spirit lamp & fuel at end 174.8 187.32 178.71 165.6 Mass of alcohol burned 1.09 1.01 0.96 0.94 Mass of water heated up 100 100 100 100 Temperature of water at the start 25 23 25 24 Temperature of water at the end 50 48 50 49 Temperature rise 25 25 25 25 The experimental results for each alcohol Using our results, we could calculate how much heat was produced in the burning of each alcohol. The reaction is exothermic, as more energy is needed to make bonds The results The alcohol The energy released in the combustion of that alcohol (KJmol ) Methanol 423.85 Ethanol 478.22 Propanal 656.25 Butanol 826.60 The theoretical results for each alcohol In this next stage of the investigation I am going to find the theoretical results, to compare these with the experimental results The alcohol The energy released in the combustion of that alcohol (KJmol ) Methanol 502 Ethanol 654 Propanol 1500 Butanol 1999 The results of both theoretical and experimental calculations The alcohol Molar mass The energy produced (Experimental values) The energy released (the theoretical values) Methanol 44 423.85 502 Ethanol 46 478.22 654 Propanol 60 656.25 1500 Butanol 74 826.60 1999 Analysis If we...

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