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6.7 Grahamís Law of Diffusion

The phenomenon of diffusion of a gas can be defined as the tendency of a gas to spread uniformly throughout the space available to it.

The relation between its density and the rate of diffusion of a gas can be represented by Grahamís law which states that "The rate of diffusion of a gas is inversely proportional to the square root of its density under given conditions of temperature and pressure."

It can be mathematically expressed as

If r1 & r2 are rates of diffusion with densities d1 & d2 the above equation becomes,

Vapor density of a gas can be calculated if 0.08 dm3 of gas diffuses in the same time as 0.002 dm3 of chlorine having vapor density 35.5.

r1 = rate of diffusion of gas = 0.08 dm3/t

r2 = rate of diffusion of chlorine = 0.002 dm3/t

D1 = ?

D2 = 35.5



6.1 The Gaseous States Properties
6.2 Boyle's Law
6.3 Charle's Law
6.4 Pressure - Temperature Law
6.5 Gay Lussac's Law
6.6 Avogadro's Law
6.7 Graham's Law of Diffusion
6.8 General Gas Equation

Chapter 7

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