Which of the following is not an assumption of the kinetic model of an ideal gas?
Correct answer: C. All particles of gas has same speed
- A. Collisions between molecules and walls of container are elastic
- B. The duration of collision between molecules is very short
- C. All particles of gas has same speed
- D. All particles of gas have same mass
Explanation
In the kinetic model of an ideal gas, the assumption is that gas molecules are in constant random motion, colliding with each other and the walls of the container. However, it does not assume that all particles have the same speed. The model considers a distribution of speeds among the gas particles, and the average kinetic energy of the particles is related to the temperature of the gas. So, the correct statement is that all particles do not have the same speed in the kinetic model of an ideal gas.Postulates of Kinetic Theory of Gases are as follows1.The molecules in a gas are small and very far apart. Most of the volume which a gas occupies is empty space.Gas molecules are in constant random motion. Just as many molecules are moving in one direction as in any other.Molecules can collide with each other and with the walls of the container. Collisions with the walls account for the pressure of the gas.When collisions occur, the molecules lose no kinetic energy; that is, the collisions are said to be perfectly elastic. The total kinetic energy of all the molecules remains constant unless there is some outside interference with theThe molecules exert no attractive or repulsive forces on one another except during the process of collision. Between collisions, they move in straight lines.
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About Kinetic Molecular Theory
Kinetic molecular theory explains gases as rapidly moving particles separated by large distances, with negligible volume and negligible intermolecular attraction in the ideal model. It relates temperature to average kinetic energy and explains gas pressure, Boyle's and Charles's laws, diffusion, effusion and the conditions under which real gases deviate from ideal behavior.
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