Gibbs Free Energy Formula:
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Definition: Gibbs Free Energy of Products is the quantitative measure of the energy associated to do work of the products in a chemical reaction of a system.
Purpose: It helps determine the spontaneity of chemical reactions and the maximum reversible work that can be performed by a thermodynamic system.
The calculator uses the formula:
Where:
Explanation: The Gibbs free energy of the reaction is added to the Gibbs free energy of the reactants to determine the Gibbs free energy of the products.
Details: Gibbs free energy determines whether a process will occur spontaneously at constant temperature and pressure. Negative ΔG indicates a spontaneous process.
Tips: Enter the Gibbs free energy values for both the reaction and reactants in Joules. The calculator will sum these values to determine the Gibbs free energy of the products.
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), where ΔH is enthalpy and ΔS is entropy.
Q3: What does a negative ΔG value mean?
A: A negative ΔG indicates a spontaneous reaction, while positive ΔG indicates non-spontaneous.
Q4: Can Gibbs free energy be zero?
A: Yes, at equilibrium ΔG = 0, meaning the forward and reverse reactions occur at the same rate.
Q5: How is Gibbs free energy related to equilibrium constant?
A: ΔG° = -RT lnK, where R is gas constant, T is temperature, and K is equilibrium constant.