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How much Energy is Released from the Combustion of Various Alcohols Aim To investigate how much heat energy is released when various alcohols (methanol, ethanol, propan-1-ol, butan-1-ol, and pentan-1-ol) combust. SCIENTIFIC BACKGROUND AND PREDICTION Scientific Background of Alcohols Methanol, ethanol, propan-1-ol and butan-1-ol are part of the alcohol homologous compound series, which is defined by their function group of -OH. Below is the structure of ethanol: The general formula for alcohols is CnH2nn+1OH. As I have proved earlier on in my prediction, larger alcohol chains have release more energy when combusted because they have more bonds, but this also means they have a higher boiling point: Alcohol Formula Boiling point (oC) Methanol CH3OH 65 Ethanol C2H5OH 78 Propan-1-ol C3H7OH 97 Butan-1-ol C4H9OH 117 Pentan-1-ol C5H11OH 137 Ethanol burns with the following equation: Ethanol + oxygen ==> carbon dioxide + water 2CH3OH + 3O2 ==> 2CO2 + 4H2O This means that the burning of an alcohol (in this case ethanol) releases only carbon dioxide and water, which are environmentally friendly products so alcohols as fuels are environmentally friendly....

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