DIFFUSION--GRAHAM'S LAW OF DIFFUSION
 
DIFFUSION OF GASES
 
Inter mixing of two or more gases to form a homogeneous mixture without any chemical change is called "DIFFUSION OF GASES" . Diffusion is purely a physical phenomenon. Gases diffuse very quickly due to large empty spaces among molecules. Different gases diffuse with different rates (velocities).
GRAHAM'S LAW OF DIFFUSION
 
Graham's law is a quantitative relation between the density and rate of diffusion of gases.
STATEMENT
 
The rate of diffusion of a gas is inversely proportional to the square root of its density.
The comparative rates of diffusion of two gases are inversely proportional to the square root of their      densities.
MATHEMATICAL REPRESENTATION OF THE LAW
 
Consider two gases A and B having mass densities d1 and d2 and their rates of diffusions are r1 and r2 respectively.
According to Graham's law of diffusion:
For gas A:

OR
                  ..................(i)
For gas B:

OR
                  ..................(ii)
Dividing equation (i) by equation (ii)
Since density a molecular mass, therefore, we can replace density d by Molecular mass M.
    
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