Which one of the following is a postulate of kinetic theory of gases?
Correct answer: A. Molecules do not exert any force on each other
- A. Molecules do not exert any force on each other
- B. The size of molecules is much larger than the separation between the molecules
- C. A finite volume of gas consists of a very small number of molecules
- D. The gas molecules are not in random motion
Explanation
A postulate of the kinetic theory of gases is that molecules exert no force on one another except during the instant of collision, which is why an ideal gas has no intermolecular potential energy. The other options invert real postulates: molecules are much smaller than their separation, a finite volume holds a very large number of them, and their motion is random.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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Thermal equilibrium and heat explain how temperature and energy transfer are related, while molar specific heats describe the heat required by a gas at constant volume or constant pressure. The first law connects heat supplied, work done and change in internal energy, with sign conventions kept distinct from temperature changes.
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