Question

Which of the following best defines Gibb's Free energy?

A. Gibbs free energy is defined as the energy portion of a thermodynamic system available to do work.
B. Gibbs free energy is defined as the entropy portion of a thermodynamic system available to do work.
C. Gibbs free energy is defined as the spontaneous portion of a thermodynamic system available to do work.
D. Gibbs free energy is defined as the adiabatic portion of a thermodynamic system available to do work.