Gibbs free energy various forms

[Raghav Gupta]

What is the difference between 1) ΔG°' and ΔG°
and 2) ΔG°' and ΔG ?
ΔG° I think it is the gibbs free energy at standard state means at room temperature 1 atm pressure.

 

[Titan97]

$\Delta G^0$ is constant at all conditions. Its $\Delta G$ that changes with change in conditions.

 

[Raghav Gupta]

What about ΔG°' ?

 

[Titan97]

Where did you read it?

 

[Raghav Gupta]

It was given in the question of our assignment.

 

[Alcathous]

May be something like the conditions that are common in your field of science, say pH is 7 and temp is 36 °C.

 

[Chestermiller]

What is the difference between 1) ΔG°' and ΔG°
and 2) ΔG°' and ΔG ?
ΔG° I think it is the gibbs free energy at standard state means at room temperature 1 atm pressure.

ΔG⁰ is the change in free energy between state 1 and state 2, whereState 1: Stoichiometric quantities of pure reactants in separate containers, each at temperature T and 1 atm pressure

State 2: Corresponding stoichiometric quantities of pure products in separate containers, each at temperature T and 1 atm pressure

So ΔG⁰ is a function of temperature.

Chet

 

[Alcathous]

He didn't ask about that.

 

[Chestermiller]

$\Delta G^0$ is constant at all conditions. Its $\Delta G$ that changes with change in conditions.

He didn't ask about that.

What do the words "ΔG° I think it is the gibbs free energy at standard state means at room temperature 1 atm pressure." mean to you?

Chet

 

[Chestermiller]

I've never seen ΔG⁰' used before, but, apparently ΔG⁰' is the value of ΔG⁰ at 25 C (see post #7).

Incidentally, regarding ΔG, this is the change in free energy if the pressures of the pure species in States 1 and 2 (see post #7) are not all equal to 1 atm.

Chet