## Very first learning objective on 2nd page of thermodynamics

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

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

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

Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

### Very first learning objective on 2nd page of thermodynamics

"Understand why reaction free energy depends on pressure and the equilibrium constant."
I understand the relationship between free energy and the equilibrium constant, but I'm not sure what pressure has to do with gibbs free energy. Is it referring to changing pressure by changing volume and applying Le Chatelier's principle or is it referring to a mathematical relationship that I may have missed?

Rita Chen 1B
Posts: 112
Joined: Sat Jul 20, 2019 12:15 am

### Re: Very first learning objective on 2nd page of thermodynamics

Maybe it's talking about delta G, which uses RT lnQ, which may depend on pressures?

305421980
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

### Re: Very first learning objective on 2nd page of thermodynamics

Because the equation -RTlnK includes the equilibrium constant and the constant can involve partial pressures.