

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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