Entropy (HSC SSCE Chemistry): Flashcards

Randomness, disorder, or chaos in a substance

$S°$

$\text{J K}^{-1}\text{mol}^{-1}$

Non-zero (unlike enthalpy)

Solids < liquids < gases

$\Delta S° = \Sigma S°(prod) - \Sigma S°(react)$

Must include (have non-zero values)

Increasing disorder/entropy

H₂O(l): 70, H₂O(g): 189

Higher entropy (more ways to arrange atoms)