Unformatted text preview: o a vacuum. The effusion rate measures how fast this happens. Graham's Law the rate of effusion is inversely proportional to the square root of the mass of its particles. 3 2 8 Effusion
Passage of gas through a small hole, into a vacuum. The effusion rate measures how fast this happens. Graham's Law the rate of effusion is inversely proportional to the square root of the mass of its particles. M2 Rate of effusion for gas 1 = Rate of effusion for gas 2 M1
49 50 Deriving
The rate of effusion should be proportional to urms Effusion Rate 1 = urms 1 Effusion Rate 2 = urms 2 Deriving
The rate of effusion should be proportional to urms Effusion Rate 1 = urms 1 Effusion Rate 2 = urms 2
effusion rate 1 u rms 1 = = effusion rate 2 u rms 2
51 Diffusion
The spreading of a gas through a room. Slow considering molecules move at 100's of meters per second. Collisions with other molecules slow down diffusions. Best estimate is Graham's Law. 3RT M1 = 3RT M2 M2 M1
52 Helium effuses through a porous cylinder 3.20 time faster than a compound. What is it's molar mass? If 0.00251 mol of NH3 effuse through a hole in 2.47 min, how much HCl would effuse in the same time? A sample of N2 effu...
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 Spring '08
 FREEMAN
 Mole, pH

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