Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is:
Correct answer: D. The same as a hydrogen molecule
- A. Two times less than a hydrogen molecule
- B. Two times that of hydrogen molecule
- C. Four times that of a hydrogen molecule
- D. The same as a hydrogen molecule
Explanation
The average kinetic energy of an atom is given as 3/2 KT. ∴ It does not depend on the mass of the atom.
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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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