The Third Law of Thermodynamics: the entropy of a perfect (ionic) crystal at 0K is zero bcus there is
NO disorder (everythings is positioned perfectly)
○ S values at other temps must be higher
Standard Entropy
- Standard Entropies S° (at 298K and 1 atm) (must be given)
- Pure elements have lower entropy values than larger/complex molecules
○ More complex molecules have higher S° because more ways the molecules can be arranged
= J/K x mol
○ Total entropy of products – total entropy of reactants