Difference between G and G(o)

  • #1
Krushnaraj Pandya
Gold Member
697
73

Homework Statement


What is the Difference between delta G and delta G°?
I have encountered them in various equations but their exact meaning and difference is never mentioned.°
 

Answers and Replies

  • #2
mjc123
Science Advisor
Homework Helper
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ΔG° is the value of ΔG with all reagents in their standard states. You ought to have encountered this definition in your study of thermodynamics.
For example, if ΔG is the free energy change for a reaction in a system described by the reaction quotient Q (have you come across this?), then
ΔG = ΔG° + RTlnQ
At equilibrium Q = Keq and ΔG = 0, so
ΔG° + RTlnKeq = 0
 
  • #3
Krushnaraj Pandya
Gold Member
697
73
ΔG° is the value of ΔG with all reagents in their standard states. You ought to have encountered this definition in your study of thermodynamics.
For example, if ΔG is the free energy change for a reaction in a system described by the reaction quotient Q (have you come across this?), then
ΔG = ΔG° + RTlnQ
At equilibrium Q = Keq and ΔG = 0, so
ΔG° + RTlnKeq = 0
Yes I have come across this, but didn't realize the exact difference. Thank you for the clarification :D
 

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