1.

One mole of nitrogen gas at 0.8 atm takes 38 seconds to diffuse through a pinhole, whereas one mole of an unknown compound of xenon with fluorine at 1.6 atm takes 57 seconds to diffuse through the same hole. Calculate molecular formula of the compound.

Answer»

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Solution :`(r_(1))/(r_(2))=sqrt((M_(2))/(M_(1)))xx(P_(1))/(P_(2))`
or `(n_(1))/(t_(1))xx(t_(2))/(n_(2))=sqrt((M_(2))/(M_(t)))xx(P_(1))/(P_(2))`
or `(1)/(38)xx(57)/(1) =sqrt((M)/(28))xx(0.8)/(1.6)`
`therefore M=252`


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