## Delta G

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

DianaTrujillo2K
Posts: 40
Joined: Fri Sep 29, 2017 7:04 am

### Delta G

What is the difference between ∆G and ∆G°?

soniatripathy
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

### Re: Delta G

∆G° is for fixed temperatures and does not depend on how the composition of the reaction changes as the reaction proceeds
∆G will depend on the composition of the reaction mixture and thus changes as the reaction proceeds

siannehazel1B
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

### Re: Delta G

$\Delta G^{\circ}$ is the change in free energy under standard conditions (25celcius and 1atm) while $\Delta G$ is the change in free energy under varying temp and pressure conditions. If you're calculating $\Delta G^{\circ}$, your $\Delta H^{\circ}$ and $\Delta S^{\circ}$ also need to be under standard conditions.

aaron tang 2K
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

### Re: Delta G

DeltaG: is the change in free energy under a different temperatures and pressure conditions.
DeltaGnaut: is standardized conditions for pressure (1 ATM) and temperture (25 degree celcius/298 Kelvins)