Define Gibb.s free energy and free energy change.

Gibbs Free Energy

Delta^(Theta)G (standard free energy change) is free energy change for the process at a temperature of………………when reactants react completely to form products.

In an irreversible process taking place at constant T and P and in which only pressure-volume work is being done, the change in Gibbs free energy (dG) and the change in entropy (dS) satisfy the criteria

Define the term standard free energy change (Delta G^(@)) . How is it related to the equilibrium constant K?

A spontaneous change is one in which the system suffers: an increase in internal energy lowering in entropy lowering in free energy no energy change

Free energy is the one

The dependence of Gibbs free energy on pressure for an isothermal process of an ideal gas is given by

A reaction is spontaneous if free energy change Delta G , for the reaction is negative . The question arises, how we can explain , the spontaneous reversible reaction taking the example of dissociation equilibrium , N_2O_4 hArr 2NO_2(g) . the variation of free energy with the fraction of N_2O_4 dissociated under standard conditions is shown in the figure below. The standard free energy change for the conversion of 1 mole of N_2O_4 into 2 moles of NO_2 is

Reaction A hArr B+3C at 25^(@) C temperature reaction on equilibrium. If equilibrium constant and Gibb’s free energy are Y and X respectively. The Gibb’s free energy for reaction (1)/(2) A hArr (1)/(2) B+(3)/(2) C is :

Assertion (A): The thermodynamic factor which determines the spontaneity of a process is the free energy. For a process to be spontaneous the free energy must be-ve. Reason (R ) : The change in free energy is related to the change in a process must always be positive if its is spontaneous.