Keq Calculator From Delta G

Equilibrium Constant Equation:

\[ K_{eq} = e^{-\Delta G° / (RT)} \]

Equilibrium Constant (K_eq):

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1. What is the Equilibrium Constant?

The equilibrium constant (K_eq) quantifies the position of chemical equilibrium in a reversible reaction. It relates to the standard Gibbs free energy change (ΔG°) through thermodynamic principles, providing insight into reaction spontaneity and extent.

2. How Does the Calculator Work?

The calculator uses the fundamental thermodynamic equation:

\[ K_{eq} = e^{-\Delta G° / (RT)} \]

Where:

\( K_{eq} \) — Equilibrium constant (dimensionless)
\( \Delta G° \) — Standard Gibbs free energy (J/mol)
\( R \) — Universal gas constant (8.314 J/mol·K)
\( T \) — Absolute temperature (K)

Explanation: This equation connects thermodynamics with chemical equilibrium, where a negative ΔG° indicates a spontaneous reaction (K_eq > 1) and a positive ΔG° indicates a non-spontaneous reaction (K_eq < 1).

3. Importance of K_eq Calculation

Details: Calculating K_eq from ΔG° is essential for predicting reaction direction, understanding equilibrium positions, designing chemical processes, and optimizing reaction conditions in industrial and laboratory settings.

4. Using the Calculator

Tips: Enter standard Gibbs free energy in J/mol and temperature in Kelvin. Ensure temperature is above absolute zero (T > 0 K). The result is dimensionless and represents the equilibrium constant.

5. Frequently Asked Questions (FAQ)

Q1: What does K_eq > 1 indicate?
A: K_eq > 1 indicates the reaction favors products at equilibrium, with a negative ΔG° value.

Q2: What does K_eq < 1 indicate?
A: K_eq < 1 indicates the reaction favors reactants at equilibrium, with a positive ΔG° value.

Q3: Why is temperature important in this calculation?
A: Temperature affects both the exponential term and the Gibbs free energy relationship, making it crucial for accurate K_eq determination.

Q4: Can this equation be used for all reactions?
A: This equation applies to ideal systems under standard conditions. Real systems may require activity coefficients or other corrections.

Q5: What are typical K_eq values?
A: K_eq values range from very small (10^-10) to very large (10¹⁰), indicating the extent to which reactions proceed.