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Graham's law of effusion: rate of effusion ∝

AM
BM²
C1/sqrt(M) (lighter gases effuse faster)
Dsqrt(M)
Answer & Solution
Correct answer: C. 1/sqrt(M) (lighter gases effuse faster)
Rate ∝ v_avg ∝ 1/sqrt(M). H₂ effuses 4× faster than O₂. Used in uranium isotope separation (gaseous diffusion of UF₆: ²³⁵UF₆ vs ²³⁸UF₆).
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