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h asked in Science & MathematicsChemistry · 3 years ago

Chemistry Help?

Helium and methane, CH4, are both found in natural gas and can be separated by diffusion. What is the ratio of the diffusion rates for the two species (rate of diffusion for He divided by the rate for CH4)?

2 Answers

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  • Dr W
    Lv 7
    3 years ago

    from grahams law of diffusion

    .. rate1 / rate2 = sqrt (molar mass 2 / molar mass 1)

    you want

    .. rate He / rate CH4

    so.

    .. rate He / rate CH4 = sqrt (16 g/mol) / (4 g/mol) = sqrt (4) = 2

    final answer

    .. rate He / rate CH4 = 2

  • david
    Lv 7
    3 years ago

    rate is velocity .. KE is proportional to mv^2 ... so V is prop. to 1/sqrt m

    V He = 1 / sqrt(4) = 1/2

    V CH4 = 1/ sqrt(16) = 1/4

    Rate He / Rate CH4 = (1/2) / (1/4) = 2:1 or just 2

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