Standard state Enthalpy difference of same material

shinesli · April 30, 2016, 00:27

In Fluent Tutorial Guide page 771. I've seen that when modeling the surface chemistry, the tutorial is using different Enthalpy and Entropy term for same phase of the same material. I don't really understand. Can anyone explain why they want to set different enthalpy and entropy value for same material?
Thank you!

LuckyTran · April 30, 2016, 04:16

They're not the same phase.

shinesli · April 30, 2016, 18:59

Quote:

Originally Posted by LuckyTran

They're not the same phase.

Ga_s is a solid phase. At 298K, the enthalpy of formation of Ga element at its stable phase should be 0. Is that correct? Can you further expain? Thanks!

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April 30, 2016, 04:16		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,764 Rep Power: 66	They're not the same phase.