What is meant by Enthalpy of formation of a compounds

Enthalpy of formation of compounds:

The standard molar enthalpy of formation of a compound is the enthalpy change when 1 mole of the compound is formed from its elements under the standard conditions. e.g.

H₂(g) + ½ O₂ →H₂O(l)   ∆H_f,m^Ө(298K) = -285.9kJmol^-1

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