A cylinder holds 2.0 mol of carbon dioxide at 360 K…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A cylinder holds of carbon dioxide at . Treat the molecules as rigid and straight. How much energy is in their moving, and how much in their turning? What is the total internal energy, and what share of it is in turning? Take .
Need a reminder? The key ideaShow
Each squared term in the energy of a molecule has on average. Translation gives 3 terms, rotation 2 (linear) or 3 (bent), and each active vibration 2.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Plan. Each degree of freedom carries . Count the terms for each motion.
Step 1. One term. .
Step 2. Moving. .
Step 3. Turning. .
Step 4. Total. . Turning holds of it, which is .
What if? At a higher temperature the molecules start to vibrate. Then the share in turning falls.
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