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Homework Help: Gas Effusion Rate

  1. Feb 5, 2010 #1
    The Problem
    A sample of N2 gas is contaminated with a gas. It is found that that contaminant effuses at 0.25 times the rate of N2. What is the contaminating gas?

    Choices are: He, Cl2, H2, Kr, Rn

    2. Relevant equations

    Rate x/Rate N2 = (square root of:) Mass N2/Mass x

    Where Rate x =0.25 Rate N2

    3. The attempt at a solution

    By plugging in the values I get a mass of x that is over 400, and none of the above choices weight that much

    Another option I tried is using just Nitrogen instead of N2 which gives me Mass x = 224 which comes close to the 222 that I got. But I have a feeling that it's wrong and not sure how to justify my answer
    Any help would be greatly appreciated
  2. jcsd
  3. Feb 5, 2010 #2

    Char. Limit

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    Gold Member

    Could you show what you did? I didn't get either of your answers.
  4. Feb 5, 2010 #3


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    Science Advisor
    Homework Helper
    Gold Member

    If you show us your actual math I'm sure the mistake will present itself. You have the right idea but the arithmetic is off.
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