Which two postulates of the kinetic theory are not applicable for real gases?
Answers
Explanation:
The microscopic theory of gas behavior based on molecular motion is called the kinetic theory of gases. Its basic postulates are listed in Table 1: ... 3 Molecules can collide with each other and with the walls of the container. Collisions with the walls account for the pressure of the gas
Answer:
(i) The forces of attraction between gas molecules are nil : This postulate is not valid at all pressures and temperature values. This is because at high pressure and low temperature, the molecules come close to each other. When the molecules are close to each other then the presence of intermolecular forces cannot be ruled out.
(ii) The volume occupied by the molecules themselves is negligibly small as compared to the total volume occupied by the gas. When the pressure is high and the temperature is lowered to a large extent, then the total volume of the gas decreases because of decrease in the empty space between the gas molecules whereas the volume of the individual gas molecules remains the same because the molecules themselves are incompressible. Hence under such conditions the volume occupied by the gas molecules will no longer be negligible in comparison to the total volume of the gas.