Helium diffuse twice as fast as another gasB. If the vapour density as compared to hydrogen weight of B is-

According to Graham's law of diffusion, r1r2 = M2M12rr = M24    (molecular mass of He = 4)M2 = 16Molecular mass of the unknown gas = 16Vapour density = 8Molecular mass of hydrogen = 2Vapour density = 1Thus the vapour density of the unknown gas is 8 times more than that of hydrogen. 

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