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Gibbs Energy of Reaction Calculator

Gibbs Free Energy Formula:

\[ \Delta G_{reaction} = \Delta G_{products} - \Delta G_{reactants} \]

J
J

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1. What is Gibbs Free Energy of Reaction?

Definition: Gibbs Free Energy of Reaction is the energy available to do work in a chemical reaction at constant temperature and pressure.

Purpose: It helps predict whether a reaction will occur spontaneously under given conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \Delta G_{reaction} = \Delta G_{products} - \Delta G_{reactants} \]

Where:

Explanation: The difference between the Gibbs free energy of products and reactants determines the spontaneity of the reaction.

3. Importance of Gibbs Free Energy Calculation

Details: A negative ΔG indicates a spontaneous reaction, while a positive ΔG indicates a non-spontaneous reaction that requires energy input.

4. Using the Calculator

Tips: Enter the Gibbs free energy values for both products and reactants in Joules. The calculator will determine the reaction's Gibbs free energy.

5. Frequently Asked Questions (FAQ)

Q1: What does a negative ΔG value mean?
A: A negative value indicates the reaction is thermodynamically favorable and will occur spontaneously under the given conditions.

Q2: What are typical units for Gibbs free energy?
A: The SI unit is Joules (J), though kilojoules (kJ) are also commonly used (1 kJ = 1000 J).

Q3: How is this different from enthalpy?
A: Gibbs free energy considers both enthalpy (ΔH) and entropy (ΔS) through the relationship ΔG = ΔH - TΔS.

Q4: Can this predict reaction rate?
A: No, Gibbs free energy only indicates thermodynamic favorability, not kinetic factors like reaction rate.

Q5: How does temperature affect ΔG?
A: Temperature affects the entropy term (TΔS) in the full Gibbs free energy equation.

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