The standard enthalpy change of formation ΔfHθ is the enthalpy change that takes place when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard statesBy definition, the standard enthalpy change of formation of an element is zero.The definition refers to the reaction in which one mole of the substance is formed.Ca(s) + ½O2(g) → CaO(s) ΔfHθ = -635.1 kJ mol-1
Standard Enthalpy Change of Formation
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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 8: Energetics I. Topic: Enthalpy.
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
- Experimental Determination of Enthalpy Change of Combustion
- Evaluating Sources of Error
- Standard Enthalpy Change of Neutralisation
- Experimental Determination of Standard Enthalpy Change of Neutralisation
- Enthalpy Change of a Reaction
- Hess's Law
- Hess's Law Example 2
- Hess's Law Example 3
All 21 lessons in Enthalpy · All Edexcel AS-level Chemistry topics