Question

What are the main postulates of kinetic molecular theory of gases?

Answer 1

Hint: The kinetic molecular theory of gases explains the behaviour of gases, it was proposed by Maxwell. This theory is based on the different postulates like size of particles, motion of particles of gas, interaction between the molecules, and many more.

Complete step by step answer:
Firstly, you should know the kinetic molecular theory of gases is applicable to ideal, or perfect gas.The kinetic molecular depicts the behaviour of gas, i.e. it provides the explanation leading to the development of an ideal gas.
We will discuss the postulates of the theory. There are five postulates of kinetic molecular theory.
-First postulate says that a gas is composed of a large number of particles (monoatomic or polyatomic), that are present in constant random motion.
-Second postulate is that the volume of the molecules is negligible, as we know the distance between the gas molecules is larger.
-Third postulate says the intermolecular interactions are negligible.
-Fourth postulate states that the gas molecules collide with one another, and the collisions are perfectly elastic, so we can conclude the average kinetic energy of the molecules do not change.
-Now, if the average kinetic energy of the molecules does not change, it means we can say that it depends on temperature.

Therefore, the mentioned are the main postulates of kinetic molecular theory of gases.

Note: Don’t get confused between the point that the volume of molecules is negligible, it is based on the molecules of ideal gas, and we know that molecules exert both attractive, and repulsive forces on one another.