Gibbs-Helmholtz equation is………….. .

State and explain Gibbs Helmholtz equation.

Write Gibbs Helmholtz equation giving meanings of the symbols used.

Gibbs Helmholtz equation relates the enthalpy, entropy and free energy change of the process at constant pressure and temperature as DeltaG=DeltaH-TDeltaS " (at constant P, T)" In General the magnitude of DeltaH does not change much with the change in temperature but the terms TDeltaS changes appreciably. Hence in some process spontaneity is very much dependent on temperature and such processes are generally known as entropy driven process. When CaCO_(3) is heated to a high temperature it decomposes into CaO and CO_(2) , however it is quite stable at room temperature. It can be explained by the fact that

Gibbs Helmholtz equation relates the enthalpy, entropy and free energy change of the process at constant pressure and temperature as DeltaG=DeltaH-TDeltaS " (at constant P, T)" In General the magnitude of DeltaH does not change much with the change in temperature but the terms TDeltaS changes appreciably. Hence in some process spontaneity is very much dependent on temperature and such processes are generally known as entropy driven process. Fro the reaction at 298 K, A_(2)B_(4)rarr2AB_(2) DeltaH=2" kJ" and DeltaS = 20 J/K at constant P and T, the reaction will be

Gibbs Helmholtz equation relates the enthalpy, entropy and free energy change of the process at constant pressure and temperature as DeltaG=DeltaH-TDeltaS " (at constant P, T)" In General the magnitude of DeltaH does not change much with the change in temperature but the terms TDeltaS changes appreciably. Hence in some process spontaneity is very much dependent on temperature and such processes are generally known as entropy driven process. The Dissolution of CaCl_(2).6H_(2)O in a large volume of water is endothermic to the extent of 3.5 kcal "mol"^(-1) and DeltaH for the reaction is -23.2 kcal "mol"^(-1) . CaCl_(2)(s)+6H_(2)O(l)rarrCaCl_(2).6H_(2)O(s) Select the correct statement :

Statement: In the case of an ideal gas the changes in Gibbs and Helmholtz free energies are equal to each other ( DeltaG=DeltaA ) for isothermal reversible process. Explanation: There is no change in internal energies and enthalpies for ideal gas at constant temperature.