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Helium diffuses 4 times faster than an u...

Helium diffuses 4 times faster than an unknown gas under similar conditions. Find the vapour density of unknown gas.

Text Solution

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Ratio of rates of diffusion of helium and unknown gas is given as,
`(r_(1))/(r_(2)) = sqrt((VD_(2))/(VD_(1))) (or) (4)/(1) = sqrt((VD_(2))/(2))`
`VD_(2) = 2xx 4^(2) = 32`
vapour density of unknown gas = 32
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