Pressure and Volume on Spontaneity

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

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

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

Justin Lau 1D
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am

Pressure and Volume on Spontaneity

Does pressure and/or volume affect the spontaneity of a reaction? Is it because entropy is changing when these factors change?

Samantha Kan 2L
Posts: 30
Joined: Sat Jul 22, 2017 3:00 am

Re: Pressure and Volume on Spontaneity

Yes, pressure and volume do affect the spontaneity of a reaction because they contribute to entropy. For example, when a system is expanding, there is more area and translational energy. This results in a higher entropy.

Daniisaacson2F
Posts: 30
Joined: Sat Jul 22, 2017 3:00 am

Re: Pressure and Volume on Spontaneity

Yes, you have to take into account the different ways that you can solve for deltaS. Since deltaG is the spontaneity of a reaction, it depends on S so it also depends on pressure and volume.