Vibrational spectroscopy question help Watch

RoseBrilliante
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I'm stuck on one part of a question:

'In a thermally equilibrated sample, how would you expect the fraction of vibrationally excited2H79Br molecules to compare with the fraction of excited 1H79Br molecules?'

Would there be less excited 2H79Br molecules relative to 1H79Br because the mass of 2H is larger than 1H? Or is there more to this question?

Thanks for any help(:
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username913907
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(Original post by RoseBrilliante)
I'm stuck on one part of a question:

'In a thermally equilibrated sample, how would you expect the fraction of vibrationally excited2H79Br molecules to compare with the fraction of excited 1H79Br molecules?'

Would there be less excited 2H79Br molecules relative to 1H79Br because the mass of 2H is larger than 1H? Or is there more to this question?

Thanks for any help(:
Distribution of molecules across the vibrational levels depends on the gap between the lowest and the 2nd level.

Larger gap = less molecules in the higher state. Work it out from that
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