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# Graham's Law

### cava s2d12 303 1.13 Graham's law of effusion

[...]: movement of gas molecules from areas of high concentration to areas of low concentration diffusion: movement of gas molecules from areas of high concentration to areas of low concentration
[...]: movement of gases through a tiny pore or opening effusion: movement of gases through a tiny pore or opening
HS Chemistry courses love the word effusion, but it really just means diffusing [...]. HS Chemistry courses love the word effusion, but it really just means diffusing out of an opening.
Graham's law of effusion: The rate of effusion is [-ly] proportional to the square root of the molar mass of the gas particles. Graham's law of effusion: The rate of effusion is inversely proportional to the square root of the molar mass of the gas particles.
Graham's law math: [...] Graham's law math: Rate gas1 / Rate gas2 = Sqrt{ mass gas 2 } / sqrt{ mass gas1 }
Notice that in Graham's law, gas 1 is on top on the left, but on [...] on the right. Notice that in Graham's law, gas 1 is on top on the left, but on bottom on the right.
Although Graham's law describes *effusion* rates, it can also be used to describe *[...] rates* and sometimes test-writers throw *[...] rate* questions at you and expect you to know that Graham's law relates to both. Although Graham's law describes *effusion* rates, it can also be used to describe *diffusion rates* and sometimes test-writers throw *diffusion rate* questions at you and expect you to know that Graham's law relates to both.
Graham's law is used for BOTH effusion and [...] rate problems, even though his law is called Graham's law of *effusion*. Graham's law is used for BOTH effusion and diffusion rate problems, even though his law is called Graham's law of *effusion*.
Graham's law of effusion: The rate of effusion is inversely proportional to the [...] of the molar mass of the gas particles. Graham's law of effusion: The rate of effusion is inversely proportional to the square root of the molar mass of the gas particles.
Graham's law of effusion: The rate of effusion is inversely proportional to the square root of the [...] of the gas particles. Graham's law of effusion: The rate of effusion is inversely proportional to the square root of the molar mass of the gas particles.
Created by: mr.shapard