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Define Grahm's Law of diffusion ? |
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Answer» Solution :Gase have a tendency to occupy all the available space. When two non-reactive gases are allowed to mix, the gas molecules migrate from region of higher CONECTRATION to a regionof lower concentration. This propery of gas which involves the movement of the gas molecules through another gases is CALLED diffusion. Effusion is another process in which a gas escapes from a CONTAINER through a very small hole. the rate of diffusion of effusion is inversely proportional to thsi square root of molar mass. This statement is called Graham's law of diffusion/effusion. Mathmatically, rate of diffusion `alpha=(1)/(sqrt(M))` Otherwise `(r_(A))/(r_(B))= sqrt((M_(B))/(M_(A)))` When diffusig gases are at different pressures, `(P_(A),P_(B))` `(r_(A))/(r_(B))=(P_(A))/(P_(B)) sqrt((M_(B))/(M_(A)))` where `r_(A) and r_(B)`are the rates of diffusion of A and B and the `M_(A) and M_(B)` are their respective molar masses. |
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