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Please help with this other thermodynamics problem

  1. Apr 27, 2006 #1
    i dont even know where to start with this one :confused:

    [​IMG]
     
  2. jcsd
  3. Apr 27, 2006 #2

    Curious3141

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    The rms speed of the molecules of an ideal gas at a particular constant temperature is inversely proportional to the square root of its molecular mass.

    Specifically, [tex]v^2_{rms} = \frac{3kT}{m}[/tex] where [itex]v_{rms}[/itex] is the rms speed, k is the Boltzmann constant, T is the absolute temperature and m is the molecular mass.

    Can you proceed now ?
     
  4. Apr 27, 2006 #3
    thanks for replying!

    i dont see how to get the mass though
     
  5. Apr 27, 2006 #4

    Curious3141

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    Molecular mass = sum of atomic masses of constituent atoms.

    So atomic mass of Uranium = ? (you're given this for each of two isotopes)

    And atomic mass of Fluorine = ? (you need to look this up in a Periodic Table of the Elements)

    Take the sum of atomic mass of Uranium plus six times atomic mass of Fluorine = molecular mass of [tex]UF_6[/tex] Do the math separately for both [tex]^{235}UF_6[/tex] and [tex]^{238}UF_6[/tex] to get the molecular masses for each gaseous isotope.
     
    Last edited: Apr 27, 2006
  6. Apr 27, 2006 #5
    thanks so much :!!)
     
  7. Apr 27, 2006 #6

    Curious3141

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    Sure thing.:smile:
     
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