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The standard enthalpy of formation for an element in its standard state is zero. Standard state is like the physical state ( can be either solid, liquid, or gas) that a substance would be in under standard conditions (1.00 atm and 25 °C). Therefore, in standard conditions, the standard state for carbon is solid (graphite), for water is liquid, and for hydrogen is gas. Furthermore, as an example, the enthalpy of formation for Br2 in its standard state (liquid) is zero. However, the enthalpy of formation for Br (gas) is about 111.881 kJ/mol.
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