## State of molecules

Shanzey
Posts: 120
Joined: Wed Sep 18, 2019 12:20 am

### State of molecules

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?

Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

### Re: State of molecules

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
Posts: 105
Joined: Fri Aug 09, 2019 12:17 am

### Re: State of molecules

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
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### Re: State of molecules

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

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