What is the $SI$ unit of rate of diffusion for a gas?

  • A
    $mol \cdot m^{-3} \cdot s^{-1}$
  • B
    $m^3 \cdot s^{-1}$
  • C
    $mol \cdot s^{-1}$
  • D
    $m \cdot s^{-1}$

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