Standard Gibbs Energy
| Formula / Notation | ΔG° = ΔH° - TΔS° = -RT ln K |
|---|---|
| Also Known As | Standard Gibbs free energy, ΔG°, standard free energy change |
What is Standard Gibbs Energy?
The Gibbs free energy change for a reaction under standard conditions (298 K, 1 bar, 1 M). Calculated from standard enthalpy and entropy: ΔG° = ΔH° - TΔS°. Related to the equilibrium constant: ΔG° = -RTlnK. Negative ΔG° indicates the reaction favors products at equilibrium.
Formula & Notation
Other Names / Synonyms: Standard Gibbs free energy, ΔG°, standard free energy change
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The Gibbs free energy change for a reaction under standard conditions (298 K, 1 bar, 1 M). Calculated from standard enthalpy and entropy: ΔG° = ΔH° - TΔS°. Related to the equilibrium constant: ΔG° = -RTlnK. Negative ΔG° indicates the reaction favors products at equilibrium.
Standard Gibbs energy is used to calculate equilibrium constants and predict reaction feasibility. It is tabulated for compounds and used in thermodynamic databases for process design. ΔG° values guide the synthesis of high-energy compounds and assessment of reaction energetics.
Large negative ΔG° values indicate highly exergonic reactions, which may be rapid and hazardous. This thermodynamic data is used in hazard assessments of reactive chemical processes.
The formula or notation for Standard Gibbs Energy is: ΔG° = ΔH° - TΔS° = -RT ln K