And now we're gonna talkĪbout the heat of combustion as the negative change in the enthalpy. So there are four CH2 groups in hexane, and here we have the heat of combustion. So we have six carbons and notice we have two CH3 groups, so here'sĪ CH3 and here's a CH3, so CH3 and CH3. Let me draw out the structure for hexane. In this case we're talking about methane. Is the heat that's released on the complete combustion One mole of methane, you're gonna get 890 kiloJoules of heat. Delta H zero for this reaction is negative 890 kiloJoules per one mole of methane which means one mole of methane, if you combust You're gonna get CO2 and H2O as the products of a combustion reaction. So if you take methaneĪnd react it with oxygen, you'll get carbon dioxideĪnd water as the products. Alkanes are very unreactive, but they do undergo combustion reactions.
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