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Enthalpy or Heat of Combustion

It is the amount of heat evolved or decreased in enthalpy when one mole of a substance is completely oxidized. Organic compounds containing only carbon, hydrogen, and oxygen are burnt to gaseous carbon dioxide and liquid water.

C2H6(g) + 3.5O2(g)  2CO2(g) + 3H2O(l); ΔH = –372.8 kcal

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