## dG vs dG knot

$\Delta G^{\circ} = -nFE_{cell}^{\circ}$

Bella Townsend
Posts: 50
Joined: Wed Feb 20, 2019 12:18 am

### dG vs dG knot

What is the relationship between deltaG and deltaG knot?

Chris Tai 1B
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

### Re: dG vs dG knot

DeltaG is the actual value of the change in free energy in a given chemical reaction. This value is determined by the equation deltaG = dGknot + RTlnQ, where Q is the ratio of products to reactant concentration. If there is much more reactants, then it's more likely that the deltaG value will be smaller, because the value of nRTlnQ will be negative. The opposite is true if there are much more products.
So, deltaGknot represents the change in free energy for a given chemical reaction under standard conditions, but this equation accounts for the different concentrations of reactants and products that might be present in a biological system (like a cell).

Amanda Lin 2I
Posts: 101
Joined: Sat Aug 17, 2019 12:15 am

### Re: dG vs dG knot

ΔG° is the Gibbs free energy at standard conditions. You can find ΔG using ΔG=ΔG°+RTlnQ.