Positional/Residual Entropy

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Nicole Gamboa 2M
Posts: 21
Joined: Wed Sep 21, 2016 2:56 pm

Positional/Residual Entropy

Postby Nicole Gamboa 2M » Mon Jan 23, 2017 10:27 am

Hi All,
I was going back through what we learned in the course reader about entropy, and I found myself really confused about when you need to calculate positional/residual entropy and what the difference is between the calculations of positional/residual entropy and when you calculate entropy regularly.

Kevin Tam 1J
Posts: 23
Joined: Wed Sep 21, 2016 2:59 pm

Re: Positional/Residual Entropy

Postby Kevin Tam 1J » Mon Jan 23, 2017 10:37 am

To my understanding, positional/residual entropy is calculated as the absolute entropy (the equation, I think, was derived through molecular/statistical analysis). The equation for absolute entropy is S=Kb*lnW.

On the other hand, I think that the "regular entropy" that you are talking about is just delta S, or the change in entropy. Delta S can be determined under a change in temperature, a change in volume, a change in pressure, etc.

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