## Wikipedia - Discussione:Energia di attivazione (it) Gibbs energy of activation (standard free energy of activation), $$\Delta ^{\ddagger}G^{\,\unicode{x26ac}}$$

https://doi.org/10.1351/goldbook.G02631
The standard @[email protected] difference between the @[email protected] of a reaction (either an @[email protected] or a @[email protected]) and the @[email protected] of the reactants. It is calculated from the experimental @O0432[email protected] $$k$$ via the conventional form of the absolute rate equation: $\Delta ^{\ddagger}G = R\ T\ \left[\ln (\frac{k_{\text{B}}}{h}) - \ln (\frac{k}{T})\right]$ where $$k_{\text{B}}$$ is the @[email protected] and $$h$$ the @[email protected] ($$\frac{k_{\text{B}}}{h} = 2.083\ 58\times 10^{10}\ \text{K}^{-1}\ \text{s}^{-1}$$). The values of the rate constants, and hence Gibbs energies of @[email protected], depend upon the choice of concentration units (or of the thermodynamic @[email protected]).