## Predicting signs of entropy [ENDORSED]

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

Chew 2H
Posts: 34
Joined: Fri Sep 29, 2017 7:05 am

### Predicting signs of entropy

I understand that going from solid to gas from reactant to product would lead to an increase in entropy. I also understand that increase in number of moles lead to an increase in entropy. But what happens when a reaction has an increase in the number of moles but also goes from gas to solid in the products. what happens to the entropy then?

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: Predicting signs of entropy  [ENDORSED]

In this case you would need to actually calculate the entropy change. It is not always so clear to predict when many things are changing that both increase and decrease the potential entropy of the products.