Derive Gibbs free energy equation? Starting from Entropy?
Answers
Explanation:
Derivation of Gibbs Free Energy
The above equation is very important because we now define entropy change of the universe in terms of the system, ie., the chemical reaction, where it is the change in entropy of the reaction, plus the changed induced to the surrounding by the heat transferred, that is qT.
Answer:
At constant temperature and pressure, the change in Gibbs free energy is defined as Δ G = Δ H − T Δ S \Delta \text G = \Delta \text H - \text{T}\Delta \text S ΔG=ΔH−TΔSdelta, start text, G, end text, equals, delta, start text, H, end text, minus, start text, T, end text, delta, start text, S, end text.
Gibbs free energy combines enthalpy and entropy into a single value. Gibbs free energy is the energy associated with a chemical reaction that can do useful work. It equals the enthalpy minus the product of the temperature and entropy of the system. When ΔG is positive, then reactants are favored instead.