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Gases and the Kinetic Molecular Theory

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Gases and the Kinetic Molecular Theory. Speeds of gas molecules. For a single molecule. ... used for determining molar mass of a gas. Example: ... – PowerPoint PPT presentation

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Title: Gases and the Kinetic Molecular Theory


1
Gases and the Kinetic Molecular Theory
2
Speeds of gas molecules. For a single molecule.
Kinetic energy is KE ½ mv2 m mass v
velocity For a collection of gas molecules,
the average kinetic energy is
R ideal gas constant 8.314 J/K?mol T
temperature in Kelvin
3
How fast do gas molecules move? Called the root
mean square speed of the gas.
in kg/mol
Equation gives speed in meters/second.
What is the rms speed of O2 molecules at room
temperature?
4
Boltzmann Distributions
5
Boltzmann Distributions and Molar Mass
6
Boltzmann Distributions and Temperature
7
Gas Diffusion
8
Gas Effusion
9
Grahams Law of Gas Effusion used for
determining molar mass of a gas
10
Example A sample of ethane, C2H6, effuses
through a small hole at a rate of 3.6 x 10-6
mol/hr. An unknown gas, under the
same conditions, effuses at a rate of 1.3 x 10-6
mol/hr. Calculate the molar mass of the unknown
gas.
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