Question

He and Ar are monoatomic gases and their atomic weights are 4 and 40 respectively. Under similar conditions He will diffuse through semi permeable membrane
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Answer 1

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Explanation:

Graham's law states that "at constant pressure and temperature the rate of diffusion or effusion of a gas is inversly proportional to the square root of its density" Rate of diffusion ∝1α−−√ If r1andr2 represent the rates of diffusion of two gases and d1andd2 are their respective densities then r1r2=d2d1−−√ (at constant P and T) , r1r2=M2M1−−−√×P1P2 (at constant T) . V1×t2V2×t1=d2d1−−√=M2M1−−−√V∝n (where n is no. of moles), V1∝n1andV2∝n2.