The Ideal Gas Law

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Slide 1

Ideal Gas Law

PV = nRT

P = pressure in atm

V = volume in liters

n = moles

R = proportionality constant

= 0.08206 L atm/ mol·K

T = temperature in Kelvins

Holds closely at P < 1 atm

Slide 2

Ideal Gases

Ideal gases are imaginary gases that perfectly fit all of the assumptions of the kinetic molecular theory.

Gases consist of tiny particles that are far apart

relative to their size.

Collisions between gas particles and between

particles and the walls of the container are

elastic collisions

No kinetic energy is lost in elastic

collisions

Slide 3

Ideal Gases (continued)

Gas particles are in constant, rapid motion. They

therefore possess kinetic energy, the energy of

motion

There are no forces of attraction between gas

particles

The average kinetic energy of gas particles

depends on temperature, not on the identity

of the particle.

Slide 4

Real Gases Do Not Behave Ideally

Real gases DO experience inter-molecular attractions

Real gases DO have volume

Real gases DO NOT have elastic collisions

Slide 5

Deviations from Ideal Behavior