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8 September, 00:22

A sample of br2 (g) takes 48.0 min to effuse through a membrane. how long would it take the same number of moles of ar (g) to effuse through the same membrane?

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  1. 8 September, 00:38
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    From the periodic table:

    mass of Br = 79.9 grams

    mass of Ar = 39.9 grams

    Therefore,

    molar mass of Ar = 39.9 grams

    molar mass of Br2 = 2 (79.9) = 159.8 grams

    Now,

    time for Ar / time for Br2 = sqrt (molar mass of Ar / molar mass of Br2)

    time for Ar = 48 * sqrt (39.9 / 158.9)

    time for Ar = 24.0528 minutes
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