Answer to Question #107862 in Physical Chemistry for Sani ibrahim

Question

What are the fundamental concept that are needed to model the behavior of gases

Answer 1

The behavior of ideal gases is explained by the kinetic molecular theory of gases.

1. A gas is composed of a large number of particles called molecules (whether monatomic or polyatomic) that are in constant random motion.
2. Because the distance between gas molecules is much greater than the size of the molecules, the volume of the molecules is negligible.
3. Intermolecular interactions, whether repulsive or attractive, are so weak that they are also negligible.
4. 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.
5. The average kinetic energy of the molecules of any gas depends on only the temperature, and at a given temperature, all gaseous molecules have exactly the same average kinetic energy.

So these concepts are:

• ideal gas concept
• impuls / from molecules to the walls
• collision frequency
• mean-square speed
• temperature, pressure, universal gas constant etc.