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    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #1

    Apr 21, 2011, 01:28 AM
    effusion rate
    if the effusion rate of Methane (CH4) through hole in the tank is 3.5x10^-4 mol in 15 min and the temperature is 200 degrees Celsius.
    which part of Ethane will go through the same hole in 25 min in the same temperature ?

    what I not sure is what formula I need to use for this question.

    thanks.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Apr 21, 2011, 10:07 AM

    Okay, I had to look that up, and that's more about chemistry, lol :p

    Anyway, wikipedia says:



    Hm... seems really easy, doesn't it? :)



    Then work out the number of moles.

    Rate = Moles / Time

    Oh and source: http://en.wikipedia.org/wiki/Graham%27s_Law_of_Effusion
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #3

    Apr 22, 2011, 11:40 AM
    Hi thanks for help. I was sure is will be correct to post it in physics :)

    So you told me to work out the number of moles from this formula:Rate=moles/time.

    So if the Rate for the first formula is 1.369.
    I only need to know what time I need to put in this formula? The 15 min or 25 min? Or both :)
    I guess I need to use the time of the Ethane what mean I need to use the 25 min.
    So I need to do rate*time=mole ? Do I get closer?
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    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Apr 23, 2011, 08:00 AM

    How did you get that rate? :confused:

    Rate * Time = Mole

    Rate * 15 = 3.5x10^-4

    Rate = 3.5*10^-4/15 = 0.000023333 = 2.33x10^-5 mol/min
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #5

    Apr 23, 2011, 10:39 AM
    Comment on Unknown008's post
    Ohh OK OK now I see . :)
    Well thank you for helping.
    Really thanks.
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