Gibbs Free Energy (G)
Gibbs Free Energy (G): Overview
This topic defines Gibbs free energy and explains the net work done by the system. It discusses the effects of temperature on the spontaneity of reactions. Relationship between standard free energy change and equilibrium constant is given here.
Important Questions on Gibbs Free Energy (G)
For a chemical reaction the values of and at are and respectively. What is the value of of the reaction? Calculate the of a reaction at assuming and values are constant. Predict the nature of the reaction.

Find out the value of the equilibrium constant for the following reaction at , . Standard Gibbs energy change, at the given temperature is .

For the reaction at :
. Determine the temperature at which the reaction would be spontaneous.

At , is fifty percent dissociated. Calculate the standard free energy change at this temperature and at one atmosphere.

When pentyne is treated with alcoholic at , it is converted slowly into an equilibrium mixture of pentyne ,pentyne -pentadiene of and the equilibrium was maintained at , calculate for the following equilibria.

What is the equilibrium constant for the following reaction at ?
, given that and

For the reaction and . Calculate the temperature at which is equal to zero. Also predict the direction of the reaction below this temperature.

For the reaction and . Calculate the temperature at which is equal to zero. Also predict the direction of the reaction at this temperature.

is required to melt one mole of sodium chloride. The entropy change during melting is . Calculate the melting point of sodium chloride.

List the characteristics of Gibbs free energy.

What are spontaneous reactions? What are the conditions for the spontaneity of a process?

The equilibrium constant of a reaction is , what will be the sign of ? Will this reaction be spontaneous?

Define Gibbs free energy.

Predict the feasibility of the reaction when decreases but increases.

Predict the feasibility of the reaction when both and are negative.

Predict the feasibility of the reaction when both and are positive.

The values of and for a reaction are respectively and . Then the temperature above which the reaction will become spontaneous is

The correct thermodynamic conditions for the spontaneous reaction at all temperature is

All the naturally occurring processes proceed spontaneously in a direction which leads to
