Calculating residual entropy

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navessor
Posts: 16
Joined: Fri Sep 25, 2015 3:00 am

Calculating residual entropy

Postby navessor » Mon Mar 07, 2016 8:31 pm

How do you calculate which has a greater residual entropy, NO or BF3?

PaigeBlack
Posts: 32
Joined: Fri Sep 25, 2015 3:00 am

Re: Calculating residual entropy

Postby PaigeBlack » Mon Mar 07, 2016 10:55 pm

BF3 would have a greater residual entropy because it is a more complex molecule which allows more rotation and vibration.

Aoife Galvin 2D
Posts: 9
Joined: Fri Sep 25, 2015 3:00 am

Re: Calculating residual entropy

Postby Aoife Galvin 2D » Wed Mar 09, 2016 10:21 pm

I thought that BF3 would have a greater residual entropy too, but on page 176 of the course reader, winter 2011 final exam question 1C, the answer says NO would have a greater residual entropy.

Ritika Saranath 3I
Posts: 24
Joined: Fri Sep 25, 2015 3:00 am

Re: Calculating residual entropy

Postby Ritika Saranath 3I » Thu Mar 10, 2016 4:45 pm

NO can be oriented as both NO and ON; BF3, no matter how you rotate the molecule, will look the same, because the F's are symmetric around the B. Therefore, NO has higher residual entropy, because it takes upon more orientations.


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