The number of atoms diffusing through a membrane with an area of 4 cm is 6.16×10³ atoms/sec (based on the definition of flux =M/A.t). Concentration gradient (Ac/ A x) for diffusing atoms with D=9×10- 12 cm²/sec becomes. Note: J = –D(Ac/ A x) -1.71×1023 -1.71×1024 -1.71×1022 -1.71×1024
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