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Root-mean-square speed of gas molecules (mass m):

Asqrt(kT)
Bv_rms = sqrt(3kT/m)
CkT × m
DkT/m
Answer & Solution
Correct answer: B. v_rms = sqrt(3kT/m)
v_rms = sqrt(3kT/m) = sqrt(3RT/M) where M = molar mass. From (1/2) m v_rms² = (3/2)kT (translational KE per molecule).
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