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According to Graham’s Law, at constant pressure and temperature, molecules or atoms with lower molecular mass will effuse faster than the higher molecular mass molecules or atoms. Thomas even found out the rate at which they escape through diffusion. In other words, it states that rate of effusion of gas is inversely proportional to the square root of its molecular mass. This formula is generally used while comparing the rates of two different gases at equal pressures and temperatures. Formula can be written as
is the molar mass of gas
is the molar mass of gas
is the rate of effusion of the first gas
is the rate of effusion for the second gas
It states that rate of diffusion or effusion is inversely proportional to its molecular mass.
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