Entropy trends from 4H

[Nick Pascua 2L]

Hello,

In the textbook problems, specifically 4H, there's a lot of comparing molecules and seeing which have a higher entropy. According to the Atkins solutions, it says molecules that are typically less rigid or are bigger in size compared to other molecules have higher entropy. Can anyone explain/elaborate why this is because I'm not understanding the textbook explanations? Thanks!

[705340227]

I believe that larger molecules have more possible positions for all the atoms to be in so therefore they have higher entropy. Less rigid molecules also have more opportunities for lots of possible positions.

[Lizbeth Garcia 1F]

I would like to add that when molecules can move around more they can take more positions which is why molecules that are less rigid tend to have more entropy.

[305572629]

Larger molecules have more room for higher disorder, which means the entropy would be higher.

[Kaylee Messick 3J]

Just to add on to what others have said, larger molecules have a higher mass and are more complex, and therefore have higher entropy. The textbook also references the different phases as an example. Gases have higher molar entropy because they can move around more (less rigid) while solids have lower molar entropy because they are more rigid. Hope this helps!

[Jared Limqueco 3E]

Larger molecules have a higher combination of possible states, so a higher entropy. Molecules that are not rigid are not confined in a particular position (like a gas), so they can occupy a wider range of positions

[Kyle Dizon 3A]

Molecules that are large will have more room to occupy different positions, in this case disorders, therefore the entropy value becomes higher.

[Gicelle Rubin 1E]

It's repetitive but larger molecules have higher entropy because of their mass

[Susanna Givan 2B]

would entropy increase down a column then? and across a row?