Question

Describe Kinetic Molecular theory

)Describe in sentences and pictures the terms effusion and diffusion. Find, write out and solve one effusion/diffusion problems within or at the back of the gas chapter .

Answer 1

The kinetic molecular states that

• Gases are made of large number of particles which are in constant and random motion.
• They travel in straight line until they collide with either another particle or walls of the container.
• The distance between the particles is larger than the particles. Hence it can be interpreted that most of the volume of the gas is empty.
• The force of attraction between the particles or between the particles or the gas is zero.
• The collision between either the particles or between the particles and the wall is elastic.
• The average kinetic energy of gas is dependent on temperature only.

Effusion refer to movement of the gas through restriction like a hole. These holes prevent the gas from expanding.

when the holes in the barrier are larger than the mean free path of the gas, it is called as diffusion

What is the rate of effusion for a gas that has a molar mass twice that of a gas that effuses at a rate of 4 mol/min?

Rate of diffusion of component 1/ Rate of diffusion of component 2= sqrt(M2/M1)

x= rate of effusion of second component

4/x= sqrt(2/1), x = 4/sqrt(2)= 2.83 mol/min

while diffusion refers to