Identify the postulate(s) that help to formulate a mathematical model of gases:I. A finite volume of gas consists of a very large number of molecules.II. The size of the molecules is much smaller than the separation between molecules.III. Molecules do not exert force on each other except during a collision.
Correct answer: E. I, II & III
- A. I only
- B. II only
- C. III only
- D. I & II only
- E. I, II & III
Explanation
All the above-mentioned postulates refer to the kinetic theory of gases. Gas molecules have a negligible volume as compared to the volume of the gas thus the separation of the molecules must be greater than their size. Also, the molecules do not influence each other in any way except through physical contact; and they are present in greater quantities.
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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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