Page 1 of 1

W for BH2F

Posted: Mon Feb 08, 2016 1:44 pm
by 904564128
Could you please explain how to find the degeneracy for a molecule such as BH2F? I'm still unclear on exactly what is done to find the value.

Re: W for BH2F

Posted: Mon Feb 08, 2016 6:12 pm
by Reine Nakamura 1C
For problems dealing with S=kBlnW, I find it useful to draw the Lewis structures for the molecules to determine W. If you draw out BH2F, you'll see that is a trigonal planar molecule with B in the middle, and the 2 H atoms and the 1 F atom around it. In this case, the F atom is different from the 2 H atoms and can occupy 3 different positions around the central B atom, making the degeneracy (W)= 3. Hope this clarifies things a little!

Re: W for BH2F

Posted: Tue Feb 09, 2016 8:06 pm
by Juliana Logan 1A
In the equation S=kB*ln(W), I understand how to find the degeneracy, but where does the kB value come from?

Re: W for BH2F

Posted: Tue Feb 09, 2016 9:58 pm
by Huanyu Nie 2A
kB is given. It is defined as R=kB*NA (2.03*10^23).