How to tell what happens to entropy by seeing a reaction?

[Fenared Ortiz 3K]

C12H22O11(s) + O2(g) ---> CO2(g) +H2O(l)

Given this equation how would we be able to tell what happens to entropy?

[Andy Nguyen 1A]

Normally, combustion reactions result in an increase in entropy. Based on the phase changes, we see that a solid changed into a gas and liquid, which means an increase in entropy.

[Sue Xu 2K]

You can just generally look at the phase of the phase of the reactants and products. In this reaction, the reactants are 1 solid and 1 gas, while the products are 1 liquid and 1 gas. Because liquid has higher entropy than solid, the entropy of the products is higher.

[Cynthia Tsang]

Like mentioned above, since the entropy of the products is higher, the total entropy would be a positive value.

[David Minasyan 1C]

Generally speaking, the entropy for gas > liquid > solid.

[Phillip Winters 2F]

The phase of the reactants and products are the best way of looking at a reaction and determining how entropy changes, and entropy increases from solid to liquid to gas

[Garret G 2F]

This youtube does a really good job of explaining how to predict changes in entropy: https://www.youtube.com/watch?v=ro3AnXdajAM