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Investigation - Comparing The Enthalpy Changes Of Combustion Of Different Alcohols Background Information The standard enthalpy of combustion is the enthalpy change when 1 mole of a substance is completely burned in oxygen, under standard conditions Hc. Example: CH4(g) + 2O2(g) CO2(g) + 2H2O(l) Hc = -890 KJ mol-1 Alcohols are a family of organic compounds (an homologous series) in which the OH functional group is attached to a hydrocarbon chain. The general formula of an alcohol with n carbon atoms is CnH2n +1OH. This is often shortened to ROH. Alcohols are classified as primary, secondary, or tertiary according to how many other groups (R) are bonded to the carbon that has the OH group. A primary alcohol has the OH group at the end of the chain. A secondary alcohol has the OH group in the body of the chain. A tertiary alcohol has the OH group at a branch in the chain. Alcohols burn readily to carbon dioxide...

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