|
|
||||
|
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. | ||||
 |
||||
|
For
more detail CLICK HERE
|
||||
| For latest information , free computer courses and high impact notes visit : www.citycollegiate.com | ||||