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Hydrogen gas

  1. Nov 28, 2009 #1
    1. The problem statement, all variables and given/known data
    A gas of hydrogen atoms has a fraction of atoms found in the n=2 quantum state of 0.05. What is the temperature of the gas?

    3. The attempt at a solution
    I think the gas molecules have an energy E=5/2kT (rather than E=kT ?? because diatomic gases have 5 degrees of freedom?)


    not sure how to continue
  2. jcsd
  3. Nov 28, 2009 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Since the question indicates these are hydrogen atoms, it is not considered a diatomic gas in this case.

    Try looking up Boltzmann Factors in your textbook.
  4. Nov 28, 2009 #3
    So the Boltzmann factor is

    I still don't understand what you would take as the energy of the gas. It can't have a factor of kT because then the T would cancel......
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