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Homework Help: Rms speed of molecule vs atom

  1. Jun 24, 2009 #1
    1. The problem statement, all variables and given/known data
    Heat is added until the rms speed of a helium atom has increased 50%. Find new pressure. (Not all parameters given.)

    2. Relevant equations
    rms = (3kT/m)1/2
    mass of molecule = mass of mole/NA
    Then, mass of helium molecule is 6.6x10-26kg

    3. The attempt at a solution
    Question: Is rms speed of a helium molecule the same as the rms speed of an atom. Yes, because the atoms make up the molecule? No, helium is diatomic (right?) and so that has to be taken into account??
  2. jcsd
  3. Jun 24, 2009 #2


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