Question

Using the kinetic theory, account for the observed behaviour of gases described by Dalton's law.

Answer 1

The kinetic molecular theory ofgases. explains the laws thatdescribe the behavior of gases. ...Gas molecules collide with one another and with the walls of the container, but these collisions are perfectly elastic; that is, they do not change the average kinetic energy of the molecules.

Answer 2

Postulates of Kinetic theory of gases:

The kinetic postulates are related to atoms and molecules which cannot be seen, hence it is said to provide a microscopic model of gases. These are given below.

Gases consists of tiny particles (atoms or molecules) .

These particles are so small compared with the distances between them, that the volume (size) of the individual particles can be assumed to be negligible.

The particles are in constant random motion, colliding with the walls of the container. This cause the pressure exerted by the gas.

The particles are assumed not to attract or to repel each other.

The average kinetic energy of the gas particles is directly proportional to the Kelvin temperature of the gas.

Dalton's law of partial pressure:

At constant temperature, the pressure of a mixture of two or more non-interacting gases is equal to the sum of partial pressures of the individual gases.

Partial pressure of the gases = mole fraction of the gas x total pressure