Molar Entropy

[Hasmik Dis 2F]

Why is it that a higher atomic number means higher molary entropy?

[Aanya Tanti 3C]

I'm not exactly sure but I think of it as for bigger molecules there are a greater number of micro-states and ways to distribute energy, leading to higher entropy.

[Gabriel Nitro 1E]

Hi,

As previously said, for molar entropy we always tend to look for molecules which are more complex (i.e. those which are more disordered under similar conditions relative to whatever we are comparing).

If we are comparing elements, we would look at atomic number as the inclusion of more protons (and neutrons and electrons) provide more possible microstates, increasing the degeneracy (W),and thus increasing entropy.

Hope this helps! :)

[Sara Sandri 2B]

Higher atomic number indicates greater complexity BUT there are exceptions to this. For example, if we compare Ne(g) to NH3(g), NH3 has the higher molar entropy since it is a molecule as opposed to a single atom. At first glance, we would think to say Ne has greater molar complexity since its molar mass is larger, but this is false given that NH3 has the more complex arrangement.

[Vanshika Bhushan 1A]

Larger molecules have more atoms and so they have more ways in which they can be arranged. Entropy measures disorder so larger molecules have larger entropy.

[SamayaJoshi1A]

This is because the larger the molecule (i.e. larger atomic radius) the more disorder aka ways the atoms can be placed exists.

[Madison Wong 3H]

Molar entropy increases as an atom becomes more massive due to more possibilites for degeneracy and disorder within arrangement and positions.

[Bai Rong Lin 2K]

I believe it has to do with more atoms and different arrangement of those atoms.

[Mina Tadros 3L]

The higher the atomic number, the greater the number of microstates, which increases the disorder.

[Armen_Isayan_2L]

Hello! A higher atomic means higher molar entropy due to the fact that the atom has gained more mass and radius. Therefore, this will create a greater possibility of disorder within the various positions.

[Diana Aguilar 3H]

I believe its because since larger molecules have more atoms, this will lead them to having a greater disorder/ways that the atoms can be arranged, which means larger molecules will inturn have higher entropy.