Entropy

[Rebecca Doan 2L]

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

[Anna Okabe]

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]

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]

S^o r is the standard reaction entropy

[Jessica Benitez 1K]

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]

is there an entropy of fusion?

[Tim Nguyen 2J]

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]

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