Ca(s) + 1/2O₂(g) ⇒CaO(s) is a reaction in which ΔH⁰rxn value equal to the ΔH⁰f value for cao(s).
In above reaction
calcium and oxygen react to form calcium oxide. In this reaction one mole of calcium oxide solid formed so the enthalpy change during this is reaction is considered as enthalpy of formation.
The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation.
Hence, one mole of cao is formed from a constituent atom from their elemental state is the enthalpy of formation.
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