# What is the difference between deltaG & deltaG°

What is the difference between deltaG & deltaG°

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Mohamad Afzal KhanGold

Asked: 2020-05-29T15:46:43+05:30
2020-05-29T15:46:43+05:30In: Thermodynamics & Rate Processes

9.09%Free energy criterion for equilibrium ( 1 voter )
90.91%Related to standard free energy change ( 10 voters )

Based On 11 Votes

What is the difference between deltaG & deltaG°

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The Gibbs free energy of a system at any moment in time is defined as the enthalpy of the system minus the product of the temperature times the entropy of the system. G = H - TS The Gibbs free energy of the system is a state function because it is defined in terms of thermodynamic properties that arRead more

The Gibbs free energy of a system at any moment in time is defined as the enthalpy of the system minus the product of the temperature times the entropy of the system.

G = H – TS

The Gibbs free energy of the system is a state function because it is defined in terms of thermodynamic properties that are state functions. The change in the Gibbs free energy of the system that occurs during a reaction is therefore equal to the change in the enthalpy of the system minus the change in the product of the temperature times the entropy of the system.

∆G = ∆H – ∆(TS)

If the reaction is run at constant temperature, this equation can be written as follows.

∆G = ∆H – T∆S

The change in the free energy of a system that occurs during a reaction can be measured under any set of conditions. If the data are collected under standard-state conditions, the result is the standard-state free energy of reaction (∆G°).

∆G° = ∆H° – T∆S°

The beauty of the equation defining the free energy of a system is its ability to determine the relative importance of the enthalpy and entropy terms as driving forces behind a particular reaction. The change in the free energy of the system that occurs during a reaction measures the balance between the two driving forces that determine whether a reaction is spontaneous or not.

See lessThe naught refers to standard conditions, that the only difference between the two values are that delta G naught is the change in free energy in 1 atm and 25 degrees Celsius and delta G is just the change in free energy in any other condition.

The naught refers to standard conditions, that the only difference between the two values are that delta G naught is the change in free energy in 1 atm and 25 degrees Celsius and delta G is just the change in free energy in any other condition.

See lessThis answer was edited.I wonder! DeltaG = DeltaG° + RTlnk At equilibrium deltaG = 0, DeltaG° = -RTlnk = -4.576Tlogk These are basic criteria for free energy definition.

I wonder!

See lessDeltaG = DeltaG° + RTlnk

At equilibrium deltaG = 0,

DeltaG° = -RTlnk = -4.576Tlogk

These are basic criteria for free energy definition.