(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A triatomic molecule consists of 3 atoms arranged along a straight line. The molecules can

translate and rotate but not vibrate. How many degrees of freedom are associated with this molecule?

2. Relevant equations

Molar Heat Capacity of Gases:

C_{v}= f/2(R)

f - degrees of freedom

3. The attempt at a solution

I figured that a triatomic gas would have the same translational motion as that of a monoatomic and diatomic molecule and it would have perhaps more axes of rotational motion than diatomic molecules. And from seeing that diatomic molecules have 5 degrees of freedom after ignoring vibrational motion, I am assuming that you can drop vibrational motion for triatomic molecules as well.

Would I be correct in concluding that a triatomic molecule has 6 degrees of freedom? I came to this conclusion by one more rotational axis. I'm not sure this is correct, however.

Any help would be greatly appreciated.

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# Homework Help: Degrees of Freedom for a Triatomic Molecule

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