Gibbs energy of activation ( $Δ G^{‡\circ}$ )

The Gibbs energy of activation is the standard molar Gibbs free energy change associated with going from the starting reactants to the transition state in transition state theory. It specifies the directional barrier, rather than the overall endpoint change in Gibbs free energy. Use consistent standard states when comparing Gibbs energies of activation and rate constants. See the IUPAC Gold Book: Gibbs energy of activation.

Table of contents
- Enthalpy of activation Gibbs energy of activation
- Entropy of activation Gibbs energy of activation

Enthalpy of activation ( $Δ H^{‡\circ}$ )

The standard molar enthalpy difference between the transition state and the starting reactants, at the same temperature and pressure, in transition state theory.^[ref]

Entropy of activation ( $Δ S^{‡\circ}$ )

The standard molar entropy difference between the transition state and the starting reactants, at the same temperature and pressure, with specified standard states, in transition state theory.^[ref]

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