Phase Transition Entropy

When substances undergo phase transitions such as melting, boiling, sublimation, the entropy changes. The calculation of this entropy change is straightforward since the process occurs at constant temperature and pressure. Two parameters are needed: the enthalpy and the temperature of the transition.

[@NeonDreamingOutLoud]

when do we include moles (n) in the phase transition formula ?

[@johnhagen1193]

If we want to calculate the actual entropy change for a given amount of substance, we would do that.