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27-10-2017
Chemistry

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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?

Respuesta :

27-10-2017

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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