1. What is Gibbs Free Energy of Reactants?

Definition: Gibbs Free Energy of Reactants is the quantitative measure of the energy associated to do work of the reactants in a chemical reaction of a system.

Purpose: It helps determine whether a chemical reaction will occur spontaneously under constant temperature and pressure.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The Gibbs free energy change of the reaction is calculated by subtracting the Gibbs free energy of the reactants from that of the products.

3. Importance of Gibbs Free Energy Calculation

Details: Gibbs free energy determines reaction spontaneity. If ΔG is negative, the reaction is spontaneous; if positive, non-spontaneous; if zero, the system is at equilibrium.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for Gibbs free energy?
A: Values vary widely but are typically in the range of -100 to +100 kJ/mol for most chemical reactions.

Q2: How does temperature affect Gibbs free energy?
A: Gibbs free energy is temperature dependent (ΔG = ΔH - TΔS). Higher temperatures can make entropy terms more significant.

Q3: What's the difference between ΔG and ΔG°?
A: ΔG is for actual conditions, while ΔG° is for standard conditions (1 atm pressure, 1M concentration, 25°C).

Q4: Can Gibbs free energy predict reaction rates?
A: No, it only predicts reaction spontaneity, not kinetics or reaction rates.

Q5: What units are used for Gibbs free energy?
A: The SI unit is Joules (J), but kilojoules (kJ) are also commonly used (1 kJ = 1000 J).