Looks like you've been studying hard for this test; I m taking it too this saturday(Nov 8th), and after reading all the messages sent between you and ecm; looks like you two will do in the 90 percentile; For me I m trying to do above average since there are several topics I have not yet covered in class ( I m a first semester senior, in a US institution). But back to your question:Originally posted by yevgeny
How many degrees of freedom does an ideal diatomic gas possess? How about a tri-atomic gas?
Like the energies, you have three groups that contribute to the DOF(Degrees of Freedom):
- Translational DOF : 3 (always);
- Rotational DOF : 0 (if it is a single atom),1 (for diatomic compounds) and 3 (for compounds made of more than 2 atoms)
- Vibrational DOF: (3N-5) for linear molecules, and (3N-6) for non linear
molecules; N is the number of atoms in the molecules. remark that if N<2 there is no (0) Vibrational DOF.
the total DOF is the addition of all three contributions. May I ask which question on the GRE sample this one is pertinent too?
PS:You may want to memorize the corresponding contributions to the internal energy also for the GRE.