The average kinetic energy of the molecules of an ideal gas depends only on
- A. pressure
- B. absolute temperature
- C. volume
- D. molar mass
Explanation
Average kinetic energy equals three halves of kT, so it is fixed by absolute temperature alone. This is why hydrogen and oxygen at the same temperature have the same average kinetic energy even though hydrogen molecules move much faster, being lighter. Molar mass affects speed, not energy.
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