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:

Where:

• \( \Delta G_{reaction} \) — Gibbs Free Energy of Reaction (Joules)
• \( \Delta G_{products} \) — Gibbs Free Energy of Products (Joules)
• \( \Delta G_{reactants} \) — Gibbs Free Energy of Reactants (Joules)

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.