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Heat of combustion of a hydrocarbon is based on the reaction:

fuel + oxygen --> carbon dioxide + water (unless you have some nitrogen or sulfur in the fuel, in which case it gets a little more complex)

The heat of formation of O2 is zero (O2 is the reference state)

The heat of formation of CO2 is the same as the heat of combustion for carbon

The heat of formation of H2O is the same as the heat of combustion for hydrogen

To find the heat of formation of the fuel, you subtract the heat of combustion from the heats of formation - (weighted with the stoichiometric coefficients from the balanced reaction equation).

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12y ago
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16y ago

amount of heat transferred = mass x change in temperature x specific heat

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10y ago

H=Hf (products)-Hf0(reactants)

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Q: What is the formula for finding heat formation?
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