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Re: HSC Chemistry Marathon 2016 Explain why the alkene series is generally more chemically reactive than the alkane series. (3) Alkene series are generally more reactive than alkanes are due to its functional group, the double bond. The double bond in alkenes are a site of high electron...

So when we're calculating the molar heat of combustion, for ethanol. We know its enthalpy change is negative, but instead of taking the negative value, we write the positive value instead for the amount of heat liberated? I don't know if my final value should be positive or negative??

thank you!!

Can someone clarify clarify something for me? My teacher said molar heat of combustion must be positive, as it -delta(h), but isnt combustion reactions exothermic, so its enthalpy change is negative..? I have a practical exam, and am confused on what to use? Delta H = -MC(delta.t) or without...