Formula for enthalpy change of combustion
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You usually calculate the enthalpy change of combustion from enthalpies of formation.
Explanation:
The standard enthalpy of combustion is ΔH∘c.
It is the heat evolved when 1 mol of a substance burns completely in oxygen at standard conditions. For example,
C2H2(g)+52O2(g)→2CO2(g)+H2O(l)
You calculate ΔH∘c from standard enthalpies of formation:
ΔHoc=∑ΔH∘f(p)−∑ΔH∘f(r)
where p stands for "products" and r stands for "reactants".
For each product, you multiply its ΔH∘f by its coefficient in the balanced equation and add them together.
Do the same for the reactants. Subtract the reactant sum from the product sum.
Explanation:
The standard enthalpy of combustion is ΔH∘c.
It is the heat evolved when 1 mol of a substance burns completely in oxygen at standard conditions. For example,
C2H2(g)+52O2(g)→2CO2(g)+H2O(l)
You calculate ΔH∘c from standard enthalpies of formation:
ΔHoc=∑ΔH∘f(p)−∑ΔH∘f(r)
where p stands for "products" and r stands for "reactants".
For each product, you multiply its ΔH∘f by its coefficient in the balanced equation and add them together.
Do the same for the reactants. Subtract the reactant sum from the product sum.
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