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Equal volumes of two gases A and B diffu...

Equal volumes of two gases `A` and `B` diffuse through a porous pot in `20` and `10 s`, respectively. If the molar mass of `A` is `80`, find the molar mass of `B`.

Text Solution

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Suppose volume of each gas diffused = V mL
Then by Graham.s Law `=(r_(A))/(r_(B))=(((V)/(20))/((V)/(10)))=sqrt((M_(B))/(M_(A))) rArr 1//2 =sqrt((M_(B))/(80))`
`therefore M_(B) =20 gmol^(-1)`
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