Kinetic Theory of Gases

Question 1

What are the 4 assumptions of Kinetic Theory?

Answer 1

1) Volumes of molecules/atoms are negligible
2) Forces between molecules can be ignored
3) Particle/wall collisions give rise to pressure
4) Collisions are elastic

Question 2

How can you calculate force on the container?

Answer 2

F = (#of collisions x change in momentum) / time

Question 3

How can you calculate pressure on the container?

Answer 3

p = nMWc^2 / 3V

n = # of moles
MW = molecular weight
c = velocity
V = volume of gas

Question 4

How do you calculate RMS velocity of a molecule?

Answer 4

c = sqrt(3RT / Mw)

Question 5

What is effusion>

Answer 5

Gas passing through the pores in rubber

Question 6

What is Graham’s Law of Effusion?

Answer 6

Rate of effusion depends on molecular velocity

Question 7

How do you calculate effusion rate?

Answer 7

Rate 1/Rate 2 = sqrt(Mw2) / sqrt(Mw1)

Question 8

What can effusion be used for?

Answer 8

Seperating gases of different molecular weights