chemistry 1150 chapter 5
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Combined gas law
(P1V1)/(n1T1) = (P2V2)/(n2T2)




Ideal gas law
PV=nRT or V={nRT}/{P}

The density of a gas is  proportional to its molar mass.
directly

The density of a gas is  proportional to the temperature
inversely

Gases mix  in any proportions.Each gas in a mixture behaves as if
 homogeneously
 it were the only gas present.

Dalton’s Law of Partial Pressures
Ptotal = P1 + P2 + P3 +

Postulates of the KineticMolecular Theory
Postulate 1: Particle Volume
 Because the volume of an individual gas particle is so small compared to the volume of
 its container, the gas particles are considered to
 have mass, but no volume.

Postulates of the KineticMolecular Theory
Postulate 2: Particle Motion
 Gas particles are in constant, random, straightline motion except when they collide with each
 other or with the container walls.

Postulates of the KineticMolecular Theory
Postulate 3: Particle Collisions
Collisions are elastic therefore the total kinetic energy (Ek) of the particles is constant.

If you double the temperature, what happens to the volume?
A = It doubles

Graham’s Law of Effusion
The rate of effusion of a gas is inversely related to the square root of its molar mass
1/sqrt{M}

atm for
1 Atmosphere
2 millimeters of mercury
3 torr
4 pounds per square inch
5 Bar
 1) 1atm
 2) 760 mm Hg
 3) 760 torr
 4) 14.7 lb/sq in
 5) 1.01325 bar