Gibbs free energy various forms

  • #1
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Main Question or Discussion Point

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.
 

Answers and Replies

  • #2
Titan97
Gold Member
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##\Delta G^0## is constant at all conditions. Its ##\Delta G## that changes with change in conditions.
 
  • #3
1,007
76
What about ΔG°' ?
 
  • #4
Titan97
Gold Member
451
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Where did you read it?
 
  • #5
1,007
76
It was given in the question of our assignment.
 
  • #6
40
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May be something like the conditions that are common in your field of science, say pH is 7 and temp is 36 °C.
 
  • #7
20,295
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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, where


State 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
 
  • #8
40
9
He didn't ask about that.
 
  • #9
20,295
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##\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
 
  • #10
20,295
4,296
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
 

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