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Lecture 18: Diffusion: Fick’s First and Second Laws

1:2 2310 18 moles=s 6:02 10 molecules=mole = 7 105 molecules=s. How Many Molecules are in the Pore? Pore volume: V= ˇr2 2l= ˇ(0:5nm) 3nm = 2:4nm3 (10 9 m=nm)3 = 2:4 10 27 m3 = 2:4 310 27 m 3 10 L=m = 2:4 10 24 L Assume that the concentration in the pore is the mean of the concentrations on the two sides:

  Lecture, First, Diffusion, Lecture 18, Fick, Fick s first and