ChE102 May 24, 2016 The Kinetic-Molecular Theory of Gases (Section 6.7 in Petrucci et. al.)The ideal gas lawis an empirical modelfor the behavior of gases based on experimental observations. The kinetic-molecular theoryis a model that provides theoretical justificationfor the ideal gas law. The model is based on the following assumptions: Molecular size is negligible compared with the distance that separates the molecules of a gas. Gas molecules are always moving with a distribution of molecular speeds. There are no intermolecular forces. The only interaction between molecules is during molecular collisions. Collisions of molecules with the wall of a container are elastic; no kinetic energy is lost during the collision. Today we will use these assumptions to derive the kinetic-molecular theory of gases! Imagine a cube containing gas molecules. We’ve discussed earlier that pressure arises from theforce imposed by molecules colliding with the walls of the container.