State of molecules

[Shanzey]

Does standard entropy of a reaction depend on the state of a molecule? For instance, would the standard reaction entropy of liquid water be different from that of water as a gas?

[Adam Kramer 1A]

The entropy would be different based on the different phases. This can be understood mathematically as at various temperatures, the phase would change for the substance, causing a change in entropy due to the change in the temperature.

[faithkim1L]

The standard entropy of a substance increases with an increase in the molar mass. But I also think that the standard entropy of a gas at STP takes in a lot of factors of phase change and heat capacities of solids and liquids as well.

[Joanne Lee 1J]

Yes, the standard entropy of reaction does depend on the state of the molecule.