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Define Graham’s law of diffusion.

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Graham’s law of diffusion: 

The rate of diffusion or effusion is inversely proportional to the square root of molecular mass of a gas through an orifice.

\(\frac{r_A}{r_B}=\sqrt{{M_B}{M_A}}\)

r, rB = rate of diffusion of gases A, B 

MA , MB = Molecular mass of gases A, B

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