Solution: Review Conceptual Example 7 as background for this
Chapter 14, Problem 14.85(choose chapter or problem)
Review Conceptual Example 7 as background for this problem. It is possible to convert Ficks law into a form that is useful when the concentration is zero at one end of the diffusion channel (C1 0 in Figure 14.15a). (a) Noting that AL is the volume V of the channel and that m/V is the average concentration of solute in the channel, show that Ficks law becomes t L2 /(2D). This form of Ficks law can be used to estimate the time required for the first solute molecules to traverse the channel. (b) A bottle of perfume is opened in a room where convection currents are absent. Assuming that the diffusion constant for perfume in air is 1.0 105 m2 /s, estimate the minimum time required for the perfume to be smelled 2.5 cm away. **
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