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A gas's diffusion rate varies with molecular mass m as
AInversely as the square root of mass
BDirectly as the square root of mass
CInversely as the square of mass
DDirectly as the first power of mass
Answer & Solution
Correct answer: A. Inversely as the square root of mass
Lighter molecules move faster as 1/√m, so diffusion rate falls as the square root of mass rises.
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