All Questions
10 questions
29
votes
2
answers
6k
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In counting degrees of freedom of a linear molecule, why is rotation about the axis not counted?
I was reading about the equipartition theorem and I got the following quotations from my books:
A diatomic molecule like oxygen can rotate about two different axes. But rotation about the axis down ...
user36790
8
votes
3
answers
6k
views
Extra vibrational mode in linear molecule
When calculating the number of vibrational modes for a molecule, the formulas differ for linear $(n = 3N - 5)$ and non-linear $(n = 3N - 6)$ molecules, where $n$ is number of modes and $N$ is number ...
- 491
5
votes
2
answers
3k
views
Actual Degree of Freedom of Diatomic Molecule
Ok, I have 2 very different values for degree of freedom(DOF) of diatomic molecules arising due to the difference in the vibrational DOF of the diatomic molecules.
According to this DOF wiki page:-
...
- 335
4
votes
3
answers
591
views
Why potential energy is not considered in the internal energy of diatomic molecules?
In thermodynamics, I am taught that there are 5 degrees of freedom in diatomic molecules since there are 3 for translational and 2 for rotational. I interpret degrees of freedom as "ways you can ...
- 303
3
votes
1
answer
42k
views
Degrees of freedom in a diatomic molecule [duplicate]
We know that a monatomic compound can only have 3 degrees of freedom as we can consider it to be a point mass. However now that we consider a diatomic molecule, there are 3 degrees of freedom in ...
- 427
3
votes
1
answer
2k
views
2 Extra Degree of Freedom in Linear Triatomic Molecules?
Ok, there is a bit problem in understanding Degree of Freedom of Linear Molecules specially of Triatomic Linear Molecules.
See, the DOF in general is given as $f=3N-k$.
Here,
N=Number of atoms in a ...
- 335
2
votes
0
answers
90
views
Why does $\rm{H_2 O}$ have 12 degrees of freedom?
I know there will be 3 translational D.O.F. and 3 rotational D.O.F., and it can have 4 vibrational D.O.F. (one potential and one kinetic) for each O-H Bond. But from where does 2 more D.O.F. come from?...
- 41
1
vote
1
answer
16k
views
Why does water have 9 degrees of freedom and that too all vibrational?
How does water has 9 degrees of freedom? If it can vibrate about all three atoms then why can't a diatomic molecule also have 2 instead of 1 possible vibrations?
I haven't studied quantum mechanics ...
- 644
1
vote
2
answers
335
views
Degrees of freedom for diatomic molecules [duplicate]
I have a doubt in understanding about the degrees of freedom (dof) ......as I have learned dof is nothing but the necessary parameters to specify the location and configuration of a system.....if that'...
- 529
-1
votes
2
answers
696
views
Degrees of freedom of gas molecules
What is the degrees of freedom of a three dimensional polyatomic molecule when only one vibrational mode is excited?
- 369