## 2011 Final Question 1C

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

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### 2011 Final Question 1C

Why on question 1C of the 2011 final would NO have a greater residual entropy than BF3 at OK?

Bryan Lau 3H
Posts: 53
Joined: Fri Sep 25, 2015 3:00 am

### Re: 2011 Final Question 1C

Because NO has 2 orientations: ON or NO, and oscillation between these two possible configurations contribute to higher residual entropy. BF3, on the other hand, has only 1 possible configuration. No matter how you rotate the trigonal planar, you'll get exactly the same configuration.

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