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Average speed v_avg of molecules:

Asqrt(8kT/(πm)) (Maxwell-Boltzmann average)
Bsqrt(2kT/m)
CkT
Dsqrt(3kT/m)
Answer & Solution
Correct answer: A. sqrt(8kT/(πm)) (Maxwell-Boltzmann average)
v_avg = sqrt(8kT/(πm)) = sqrt(8RT/(πM)). Slightly less than v_rms (~92.5%). Used in effusion problems (Graham's law).
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