Boltzmann Equation for Entropy:
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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!
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