What is Gibbs free energy and why is it significant in predicting the spontaneity of chemical reactions?

Gibbs free energy is the energy available to perform work, and it predicts the spontaneity of reactions by indicating whether a reaction will proceed without external input.

Gibbs free energy is the energy stored in chemical bonds, and it predicts the spontaneity of reactions by indicating the stability of reactants.

Gibbs free energy is the total energy of a system, and it predicts the spontaneity of reactions by indicating the amount of heat released.

Gibbs free energy is the kinetic energy of molecules, and it predicts the spontaneity of reactions by indicating the speed of reaction.