For this question, use the main assumptions of the Kinetic Molecular Theory of gases: 1. Gases are made up of molecules which are relatively far apart. 2. The molecules are in motion at high speeds. 3. The molecular collisions are perfectly elastic. 4. Increase in temperature increases the kinetic energy of the molecules. Which of the assumptions explains the pressure which a gas exerts? 2 and 4 2 3 1 1 and 2

The assumption that best explains the pressure which a gas exerts is:<br /><br />**2. The molecules are in motion at high speeds.**<br /><br />This is because the pressure exerted by a gas is due to the collisions of the gas molecules with the walls of the container. The high-speed motion of the molecules results in frequent and forceful collisions, which create pressure. <br /><br />While assumption 4 (increase in temperature increases the kinetic energy of the molecules) also relates to pressure, as higher kinetic energy leads to more forceful collisions, the direct explanation for pressure is the motion and collisions themselves, which is covered by assumption 2.