Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: The diffusion of two gasses

  1. Jul 14, 2011 #1
    1. The problem statement, all variables and given/known data

    I dont know how to approach this problem, any help would be appreciated.

    i have a pipe 1 meter in lenght and 4mm in diameter. it containts 2 gases, D2 and He-3.
    each half of the pipe contains the 2gases and they are both at 400psi.
    how long does it take the gases to diffuse across the pipe completely?


    2. Relevant equations

    ive looked into grahms law of diffusion but that doesnt seem to be helpful at all in this situation since it give me a proportional rate b/w two different molecules of gas

    3. The attempt at a solution

    as far as ive gotten is finding the volumes of gas in each half of the pipe... not very far.
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted