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Investigation into the Enthalpy Change of Combustion of Different Alcohols - query

mamakosj
in Chemistry

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When conducting an experiment to test the relationship between the enthalpy changes of different alchols, I came across something which i couldn't explain. Taking propan-1-ol and propan-2-ol as an example, I found that propan-1-ol had a higher enthalpy change. Could someone explain to me why this is so. (the same thing happened for butan-1-ol and butan-2-ol)

 

Although I have no precise knowledge to base my hypothesis on, I would have expected this relationship to be the other way round. Please help.

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