Class 11 Physics Kinetic Theory Specific Heat of Diatomic gases (non-rigid)

Specific Heat of Diatomic gases (non-rigid)

  • A no-rigid diatomic gas has translational, rotational as well as vibrational degrees of freedom.
  • There will be 3 translational degrees of freedom and 2 rotational degrees of freedom and 1 vibrational degree of freedom.
  • Total contribution by translational= (1/2) kBT, rotational=2x (1/2)kBT and vibrational =kB
  • Total Internal energy for 1 mole =(5/2)kBT+kBT = (7/2)kBT= (7/2)RT.
  • CV=dU/dT = (7/2) R.
  • CP=CV+R= (9/2) R.
  • γ= CP/CV =(9/7)

 

There are two independent axes of rotation(1) and(2) normal to the axis joining the two oxygen molecule.It has 3 translational and 2 rotational degrees of freedom

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