The molar specific heat Cv of a diatomic gas is (5/2)R when we treat its molecules to be rigid having no vibrations. But this assumption is not always valid especially at high temperatures. In that case, molecules are treated as non-rigid having vibrational energy also. Cv for diatomic gas with non-rigid gas molecules will be:
The molar specific heat Cv of a diatomic gas is (5/2)R when we treat its molecules to be rigid having no vibrations. But this assumption is not always valid especially at high temperatures. In that case, molecules are treated as non-rigid having vibrational energy also. Cv for diatomic gas with non-rigid gas molecules will be:
Option 1 -
(3/2)R
Option 2 -
3R
Option 3 -
(7/2)R
Option 4 -
4R
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1 Answer
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Correct Option - 3
Detailed Solution:Vibrational energy of a non-rigid gas molecule is K? T so, total energy = (5/2)K? T + K? T = (7/2)K? T
∴ C? = (7/2)R
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