The answer is elements in the elemental state.
The standard Gibbs free energy of elements in their free state is zero.
- Standard Gibbs free energy of formation is the amount of change in energy that is required for the formation of 1 mole of a substance.
- The value of Gibbs free energy has been zero for the naturally occurring elements as they are not required to be formed and occur naturally.
- The natural occurrence leads to the standard Gibbs free energy being zero and be in the elemental state.
- Examples are iodine solid and hydrogen gas.
- There are various examples catering to the standard Gibbs free energy being zero.
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