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Energy of combustion lab

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I'm writing a lab report about the "Energy of combustion of alcohols". In the lab we used combusted different alcohols in spirit burners but the alcohols we used are diluted to some percentage (e.g 91% isopropane). I remember my teach telling us to record these percentages but I'm not sure what for  :eek:  Should I simply state that it's a diluted value or am I supposed to calculate something with the percent?

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It probably has to do something with the mass of alcohol you used/measured, so then you need the percentages to calculate the exact amount of alcohol. :)

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