Calculating Change in Entropy for Phase Changes

$\Delta S = \frac{q_{rev}}{T}$

Sydney Myers 4I
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

Calculating Change in Entropy for Phase Changes

Why are there three steps to finding the change in entropy at a transition temperature? If entropy is a state function, then how does heating a substance then cooling a substance give us anything other than delta S = 0?

Benjamin Feng 1B
Posts: 102
Joined: Sat Sep 07, 2019 12:19 am

Re: Calculating Change in Entropy for Phase Changes

This is because you have to change the phase of the substance. The 2 different phases will also have different molar entropies.