Kapil posted an Question
December 17, 2020 • 22:07 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Is it possible to isolate pure ortho-hydrogen ? if not, why ? (3+3

Is it possible to isolate pure ortho-hydrogen ? If not, why ? (3+3

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  • Suman Kumar Best Answer

    https://www.google.com/url?sa=t&source=web&rct=j&url=https://chemistry.stackexchange.com/questions/96680/why-isnt-pure-ortho-hydrogen-possible-to-obtain%23:~:text%3DYou%2520cannot%2520make%2520ortho%2520hydrogen,para%2520molecules%2520of%2520zero%2520spin.&ved=2ahUKEwihwrT78dTtAhWd6XMBHQKtDVsQFjABegQIAhAE&usg=AOvVaw01YWJrOzYxdtUqadpGggOV

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    it has been possible to get pure para hydrogen by cooling ordinary hydrogen gas to a very low temperature (close to 20 K) but it is never possible to get a sample of hydrogen containing more than 75% of ortho hydrogen.Aug 15, 2020

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    okay

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    Dinesh khalmaniya 1 best-answer

    You cannot make ortho hydrogen this way because it does not represent the absolute ground state of the system. The 75% comes from the degeneracy of the Boltzmann factor: at low temperature (with no reaction catalyst) there are three times more ortho molecules with a spin of 1 than para molecules of zero

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