What is Gibb’s free energy?

Why is Gibbs free energy called 'free energy' ?

Change in Gibb’s free energy is given by

Explain: (i) Gibbs free energy is a state function. (ii) gibbs free energy is an extensive property.

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.

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

(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 do you understand by EMF and standard EMF of a galvanic cell? Write the equation relating standard electromotive force of a galvanic cell with the Gibbs's free energy of the cell reaction.

Calculate the enthalpy of formation of liquid,ethyl alcohol from' the following data : C_2H_5OH(I)+3O_2(g)rarr2CO_2(g)+3H_2O(I)/_\H=-1368kJ , C(s)+O_2(g)rarrCO_2(g)/_\H=-393kJ , H_2(g)+1/2O_2(g)rarrH_2O(I)/_\H=-287kJ s State the condition of spontaneity and equilibrium in terms of Gibbs free energy change of a system.

Does the Gibbs free energy of a substance decrease or increase if the amount of the substance is increased?