## Change in Gibbs Free Energy

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

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

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

VivianaHF2L
Posts: 29
Joined: Fri Sep 28, 2018 12:20 am

### Change in Gibbs Free Energy

What is the difference between deltaG and deltaG with a degree? Like in problem 11.21.

monikac4k
Posts: 56
Joined: Fri Sep 28, 2018 12:25 am

### Re: Change in Gibbs Free Energy

The degree symbol indicates that the reaction is occurring under standard conditions (usually 25 degrees Celsius, 1 bar pressure, etc.).

Andre_Galenchik_2L
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

### Re: Change in Gibbs Free Energy

They are connected by the equation Delta G = Delta G with a degree + RTlnQ.

Xingzheng Sun 2K
Posts: 62
Joined: Fri Sep 28, 2018 12:29 am

### Re: Change in Gibbs Free Energy

△G with Degree means it is the standard Gibbs free energy. Without a degree is not standard. It can be calculated by △G = standard△G + RTlnQ.