
How is delta G related to the equilibrium constant?
Answer
479.4k+ views
Hint: Thermodynamics is a branch of physical chemistry that deals with many forms of energy and heat. It tells us about how thermal energy is converted into other forms of energy. Gibbs free energy is used for the measurement of the maximum amount of work done in a thermodynamic system.
Complete step-by-step answer:Gibbs free energy is denoted with symbol G and its value is expressed in Joules.
Now let us discuss the relationship between the change in Gibbs free energy and equilibrium constant-
The change in Gibbs free energy is related to the change in standard Gibbs free energy that is represented by .
Now let us see the equation
Where, is change in Gibbs free energy
change in standard Gibbs free energy
is the gas constant
is the temperature on Kelvin
is the reaction quotient
At equilibrium,
and
Here, is the equilibrium constant
Therefore, on substituting the value in the above formula we get,
As
On further substituting we get,
If the value of equilibrium constant is large then it will result in negative value of change in Gibbs free energy. It indicates reaction spontaneity. It is an irreversible process that can only be reversed by external agents.
Note: Change in Gibbs free energy helps in determining the extent of chemical change and direction.
If the change in Gibbs free energy is negative then it is a spontaneous reaction.
Spontaneity depends upon the temperature of the system.
Spontaneous process releases free energy and moves to a more stable energy state.
Complete step-by-step answer:Gibbs free energy is denoted with symbol G and its value is expressed in Joules.
Now let us discuss the relationship between the change in Gibbs free energy and equilibrium constant-
The change in Gibbs free energy is related to the change in standard Gibbs free energy that is represented by
Now let us see the equation
Where,
At equilibrium,
Here,
Therefore, on substituting the value in the above formula we get,
As
On further substituting we get,
If the value of equilibrium constant is large then it will result in negative value of change in Gibbs free energy. It indicates reaction spontaneity. It is an irreversible process that can only be reversed by external agents.
Note: Change in Gibbs free energy helps in determining the extent of chemical change and direction.
If the change in Gibbs free energy is negative then it is a spontaneous reaction.
Spontaneity depends upon the temperature of the system.
Spontaneous process releases free energy and moves to a more stable energy state.
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