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how would you set this problem up?
An unknown gas effusees at .850 times the effusion rate of nitrogen dioxide, NO2. Estimate the molar mass of the unknown gas.

  • chem -

    rate1/rate2 = sqrt[M2/M2]
    I would arbitrarily pick a number, say 10 cc/min, for the effusion rate of NO2. Then 850*10 = the rate for the unknown gas. Substitute into the above equation and solve for M2.

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