Question

compare the rates of diffusionof the following pairs of gas
1)H2 and D2
2)CH4 AND He
3)SF6c and so2
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Answer 1

Rates of diffusion are inversely proportional to the molecular mass.

1) H2 Molecular mass is 2

   D2 molecular mass is 4

So, Rate  Of Diffusion of H2 > Rate  Of Diffusion of H2

2) CH4 Molecular mass is 16

    He Molecular mass is 4

So , Rate  Of Diffusion of He > Rate  Of Diffusion of CH4

3)SF6 Molecular mass is 146

   SO2 Molecular mass is 64

So, Rate  Of Diffusion of SF6 > Rate  Of Diffusion of SO2