Dalton’s Law P t = P 1 +P 2 +P 3 + ….. constant V & T)

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Dalton’s Law P t = P 1 +P 2 +P 3 + ….. constant V & T)

Dalton’s Law-Example Air contains O 2, N 2, CO 2, and trace amounts of other gases. What is the partial pressure of oxygen (P Oxygen ) at sea level, if N 2 and CO 2 pressures are kPa, 0.94 kPa, respectively?

Diffusion spreading of gas; gas particles move from areas of great concentration to areas with lower concentration until uniform.

Diffusion What are some examples of diffusion?

Effusion gas escapes a container through tiny holes or pores of a container.

Effusion

Diffusion & Effusion

Diffusion vs Effusion

Effusion if hole is small enough & gas particles big enough no effusion occurs.

Effusion What are some examples of effusion?

Graham’s Law Rate of Diffusion/Effusion : lighter gases move faster  Rate: speed, distance per time

Graham’s Law

Applying Graham’s Law 1. Which gas effuses faster, NH 3 or CCl 4 ? 2. Which gas effuses faster, CO 2 or NF 3 ?

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