Q. At which temperature will helium and oxygen molecules have the same average kinetic energy?
किस तापमान पर हीलियम और ऑक्सीजन अणुओं की औसत गतिज ऊर्जा समान होगी?
Explanation
According to kinetic molecular theory, the average kinetic energy of gas molecules depends only on temperature, not on the type of gas.
Mathematical basis: Average KE = (3/2)kT
Key points:
- All gases at the same temperature have identical average kinetic energy
- This is independent of molecular mass, pressure, or volume
- Different gases will have different average speeds, but same average KE
- This is a fundamental postulate of kinetic theory
Example: At 25°C (298 K):
- He atoms and O₂ molecules both have average KE = (3/2)kT
- He moves faster, O₂ moves slower, but same average energy
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