Understanding the G Value in Chemistry: Gibbs Free Energy Explained
Learn about the G value in chemistry, its significance, and how Gibbs free energy predicts reaction potential.
588 views
The G value in chemistry, commonly referred to as Gibbs free energy (G), indicates the amount of energy available to do work during a chemical reaction at constant temperature and pressure. The equation is G = H - TS, where H is enthalpy, T is temperature, and S is entropy. A negative ΔG implies a spontaneous reaction, while a positive ΔG means the reaction is non-spontaneous. Gibbs free energy is crucial for predicting reaction feasibility and understanding chemical equilibrium.
FAQs & Answers
- What does a negative Gibbs free energy mean? A negative Gibbs free energy (ΔG) indicates that a chemical reaction is spontaneous, meaning it can occur without needing to input additional energy.
- How is Gibbs free energy calculated? Gibbs free energy (G) is calculated using the equation G = H - TS, where H is enthalpy, T is temperature in Kelvin, and S is entropy.
- Why is Gibbs free energy important? Gibbs free energy is crucial for predicting the feasibility of reactions and understanding how reactions reach equilibrium at constant temperature and pressure.
- What is the relationship between ΔG and chemical equilibrium? At chemical equilibrium, ΔG is zero, indicating that the forward and reverse reactions occur at the same rate, and there is no net change in the concentrations of reactants and products.