Why is Gibbs free energy called 'free energy' ?

What is Gibb’s free energy?

Define Gibb’s free energy.

Define: (i) Gibbs free energy (ii) the standard free energy of formation of a substance (iii) the standard free energy change in a chemical reaction.

Change in Gibb’s free energy is given by

(i) Spontaneity of a process can be determined from the entropy change and also from the Gibbs free energy change. But the Gibbs free energy change in more useful than entropy change to determine the spontaneity of a process. Explain it. (ii) Show that Gibbs energy change of a system at certain temperature and pressure, DeltaG=DeltaH-TDeltaS .

What are the units of entropy and free energy?

State the condition of spontaneity and equilibrium in terms of Gibbs free energy change of a system.

(i) What is the relation between Gibbs free energy change and spontaneity of a process? (ii) Write down the relation between standard free energy change and equilibrium constant.

Show that in a process at constant temperature and pressure, the Gibbs free energy change of a system, DeltaG=-TDeltaS_("total") .