BRAINCAKEStandard Enthalpy Change of Combustion
The enthalpy change at 100 kPa and 298K when one mole of a substance is completely burned in oxygen, with all reactants and products in their standard states. It is given the symbol ΔcHθ.
Three parts of the definition matter:
One mole of the substance is burned, so the equation is balanced for 1 mol of fuel, even if that needs a fraction in front of O2.
Complete combustion, so all the carbon becomes CO2 and all the hydrogen becomes H2O.
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Key terms in this lesson
- standard state
- The physical state of a substance under standard conditions of 100 kPa and 298 K.
More in Enthalpy
- Chemical and Heat Energy
- Enthalpy and Enthalpy Change
- Exothermic and Endothermic Reactions
- Standard Conditions
- Experimental Determination of Enthalpy Change of Combustion
- Evaluating Sources of Error
- Standard Enthalpy Change of Neutralisation
- Experimental Determination of Standard Enthalpy Change of Neutralisation
All 21 lessons in Enthalpy · All Edexcel AS-level Chemistry topics