ΔG a Partir de K
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
ΔG°
About this calculator
The Gibbs energy calculator from K is a useful tool for chemists and academics who need to calculate the standard Gibbs energy (ΔG°) of a chemical reaction based on the equilibrium constant (K).
This calculator uses the mathematical formula ΔG° = −RT·lnK, where R is the gas constant, T is the temperature in Kelvin and lnK is the natural logarithm of K. The Gibbs energy is an important measure of the spontaneity of a chemical reaction.
When to use this calculator? It's ideal for calculating the Gibbs energy of chemical reactions at equilibrium conditions. For example, you can use it to calculate the Gibbs energy of an acid-base equilibrium reaction.
Important considerations: make sure to use consistent units for temperature and equilibrium constant. Also, verify if the chemical reaction is at equilibrium before calculating the Gibbs energy.
Frequently asked questions
What is the equilibrium constant (K)?
The equilibrium constant (K) is a measure of the proportion between the products and reactants of a chemical reaction at equilibrium. It is calculated as the ratio of the concentrations of the products and reactants.
What are the units of the Gibbs energy (ΔG°)?
The units of the Gibbs energy (ΔG°) are usually expressed in joules (J) or calories (cal).
Why is it important to calculate the Gibbs energy (ΔG°)?
Calculating the Gibbs energy (ΔG°) is important because it provides information about the spontaneity of a chemical reaction. A negative Gibbs energy indicates that the reaction is spontaneous, while a positive Gibbs energy indicates that the reaction is not spontaneous.
What are the units that I can use for the temperature (T)?
You can use units of temperature such as Kelvin (K), degrees Celsius (°C) or degrees Fahrenheit (°F). Make sure to use the same unit for the temperature and the equilibrium constant.