State of molecules

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State of molecules

Postby Shanzey » Sat Feb 08, 2020 11:42 pm

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
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Re: State of molecules

Postby Adam Kramer 1A » Sat Feb 08, 2020 11:55 pm

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.

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Re: State of molecules

Postby faithkim1L » Sat Feb 08, 2020 11:57 pm

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
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Re: State of molecules

Postby Joanne Lee 1J » Mon Feb 10, 2020 5:31 pm

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

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