The

Gibbs free energy change of activation (IG*) was found to be highest in aqueous isopropanol and lowest in water showed the formation of activated state is more favorable in water than in methanol, ethanol and isopropanol.

The thermodynamics of the adsorption process is explored by means of calculation of the

Gibbs free energy, enthalpy and entropy changes, which provide important insights into the overall mechanism of Cr(VI) adsorption.

The

Gibbs free energy of transfer [([DELTA]G[degrees]).sub.tr] of fenofibrate from pure water to the aqueous solution of carrier was calculated as (14);

For the

Gibbs free energy, there was an increase in the values with the increase of the temperature of the drying air.

where, [DELTA][G.sub.m] is the

Gibbs free energy of mixing.

In the framework of the regular solution model [6, 7], the second derivatives of the free

Gibbs free energy [[mu].sub.ij] of the solid solution [Hg.sub.1-x][Mn.sub.x][Te.sub.1-y][Se.sub.y] were obtained, of which an matrix of 4x4 dimensions was formed:

Gibbs free energy at temperature 298 K was calculated by the following

Gibbs free energy equation [24]:

We also calculate the

Gibbs free energy and find characteristic swallow tail behavior.

The concentrations of species in the mixture are computed using thermophysical properties (enthalpy, entropy,

Gibbs free energy) of the system.

And reliable calculation of such thermodynamic functions of entropy, enthalpy, and

Gibbs free energy requires data on heat capacity [5].

Then, the variation of

Gibbs free energy [DELTA][G.sup.0] can be calculated based on (11) [27].