## W for BH2F

Boltzmann Equation for Entropy: $S = k_{B} \ln W$

904564128
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### W for BH2F

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.

Reine Nakamura 1C
Posts: 38
Joined: Fri Sep 25, 2015 3:00 am

### Re: W for BH2F

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!

Juliana Logan 1A
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### Re: W for BH2F

In the equation S=kB*ln(W), I understand how to find the degeneracy, but where does the kB value come from?

Huanyu Nie 2A
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

### Re: W for BH2F

kB is given. It is defined as R=kB*NA (2.03*10^23).

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