By convention, the standard enthalpy of formation ($\Delta_f H^\circ$) of an element in its reference (standard) state is taken as:
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Question

By convention, the standard enthalpy of formation ($\Deltaf H^\circ$) of an element in its reference (standard) state is taken as:

Accepted Answer

By standard thermodynamic conventions, the standard enthalpy of formation of an element in its most stable physical state (reference state) at 298.15 K and 1 bar pressure is defined as zero.

Chemical Thermodynamics

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