mol wt of gas

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the pressure in a vessel that contained pure oxygen dropped from 2000 torr to 1500 torr in 55 min as the oxygen leaked through a small hole into a vacuum.when the same vessel was filled with another gas,the pressure dropped from 2000 torr to 1500 torr in 85 min.what is the molecular weight of the gas ??

#Chemistry #Physical Chemistry

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A ·2009-09-12 00:12:58

r_1r₂ = rate of diff of O₂rate of diff of gas X = v₁*t₂v_{2 * t₁}

v₁ --> Vol of of O₂ Diff.
t₁-->Time taken for O₂ to diff.

v₂--> Vol of of gas X Diff.
t₂-->Time taken for O₂ to diff.

There fore 500 * 85500*55 = √Mol. wt of gas XMol. wt of O₂ --> ACc to greyham's law...

Now solve to get ans. 289/121 * 32 = 76.42 gm ... Is this the ans.?

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