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# Effusion

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Sections
Pressure Units
The Ideal Gas Law
The Ideal Gas Law Derivations
The Ideal Gas Law Applications
Chemistry Gas Laws
Chemistry Gas Laws: Combined Gas Law
Mole Fraction
Partial Pressure
The Ideal Gas Law: Molar Mass
The Ideal Gas Law: Density
Gas Stoichiometry
Standard Temperature and Pressure
Effusion
Root Mean Square Speed
Kinetic Energy of Gases
Maxwell-Boltzmann Distribution
Velocity Distributions
Kinetic Molecular Theory
Van der Waals Equation
Boyle's Law (IGNORE)
Charles Law (IGNORE)
Ideal Gas Law (IGNORE)

Effusion is the escaping of gas molecules or atoms through a pinhole.

###### Effusion

Concept #1: Effusion

Concept #2: Rate of Effusion

Example #1: Rank the following in order of increasing rate of effusion.

O2           PF5           CO2           Xe

Concept #3: Graham’s Law of Effusion

Example #2: Calculate the ratio of the effusion rates of helium to methane (CH4).

Practice: If Hhas an effusion rate that is 3.72 times faster than a gas, what is the identity of the unknown gas?

Practice: How many times faster will H2 gas pass through a pinhole into an area of vacuum than O2 gas?

Practice: It takes 6.3 minutes for 2.3 L argon to effuse through a semipermeable membrane. How long would it take for 2.3 L of chlorine gas to effuse under similar conditions?