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Gibbs Free Energy

A thermodynamic potential that measures the amount of energy available in a chemical system at constant pressure and temperature, crucial for predicting spontaneity.
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The statement of the theorem

Define the change in Gibbs Free Energy for a process occurring at constant pressure and temperature as: ΔG=ΔH−TΔS \Delta G = \Delta H - T \Delta S where ΔH\Delta H is the change in enthalpy, ΔS\Delta S is the change in entropy, and TT is the absolute temperature. Alternatively, for a reaction aA+bB→cC+dDaA + bB \rightarrow cC + dD, the change is: ΔG=∑iνiΔGi∘=−RT∑iνiΔSi∘ni \Delta G = \sum_{i} \nu_i \Delta G_i^\circ = -R T \sum_{i} \nu_i \frac{\Delta S_i^\circ}{n_i}
Source: Wikipedia