## Entropy

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

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

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

Rebecca Doan 2L
Posts: 51
Joined: Thu Jul 27, 2017 3:01 am

### Entropy

What is the difference between S°m, S°r, and S°f?

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

### Re: Entropy

I'm not exactly sure because you didn't give context, but S^0 m is most likely entropy for the melting point, r is for reactants and f is for final.

Justin Chang 2K
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

### Re: Entropy

S^o (m) is the standard molar entropy (the values in the back of the textbook). I think S^o (f) is similar to the S^o (m). I don't quite know what S^o (r) is though.

Sarkis Sislyan 1D
Posts: 31
Joined: Thu Jul 27, 2017 3:00 am

### Re: Entropy

S^o r is the standard reaction entropy

Jessica Benitez 1K
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

### Re: Entropy

This is what I think:
S°m would be the Standard Molar Entropy
S°r would be the Standard Reaction Entropy
S°f would be the Standard Entropy of Formation

Dylan Mai 1D
Posts: 70
Joined: Sat Jul 22, 2017 3:00 am

### Re: Entropy

is there an entropy of fusion?

Tim Nguyen 2J
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

### Re: Entropy

Dylan Mai 1D wrote:is there an entropy of fusion?

I don't think it is a tabulated value in any of the tables or appendixes in the textbook, but you can definitely calculate it similarly to calculating the entropy of vaporization.
entropy of fusion = enthalpy of fusion/melting point (Tb)

Cristina Sarmiento 1E
Posts: 52
Joined: Wed Nov 16, 2016 3:02 am

### Re: Entropy

S°m is molar entropy.
S°f is standard entropy of formation.
S°r is standard reaction entropy.