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Why the eq. H2(g)+1/2 O2(g)-->H2O(g) doesn't represent standard enthalpy of formation of water?

Why the eq. H2(g)+1/2 O2(g)-->H2O(g) doesn't represent standard enthalpy of formation of water?

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1 Answers

Aman Bansal
592 Points
10 years ago

Dear Neha,

By Defination,

The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states (the most stable form of the element at 1 bar of pressure and the specified temperature, usually 298.15 K or 25 degrees Celsius). Its symbol is ΔHfO or ΔfHO.

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