## free energy and standard free energy

$\Delta S = \frac{q_{rev}}{T}$

Andrew Nguyen 2I
Posts: 68
Joined: Fri Sep 29, 2017 7:07 am

### free energy and standard free energy

Why is the free energy related to Q while the standard free energy is related to K?

Lena Nguyen 2H
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am
Been upvoted: 1 time

### Re: free energy and standard free energy

Standard free energy is related to K by the equilibrium composition. If K is over 1, then the standard free energy should be negative as the forward reaction is favored. If K is less than 1, then the standard free energy should be positive as the reverse reaction is favored. Q is for reactions that have not reached equilibrium and its composition tells us which way the reaction is heading because of the sign of the free energy.