72. (II) Oxygen diffuses from the surface of insects to
Chapter 13, Problem 72(choose chapter or problem)
72. (II) Oxygen diffuses from the surface of insects to the interior through tiny tubes called tracheae. An average trachea is about 2 mm long and has cross-sectional area of 2 X 10-I>m2. Assuming the concentration of oxygen inside is half what it is outside in the atmosphere. (a) show that the concentration of oxygen in the air (assume 21%. is oxygen) at 20C is about 8.7 mol/m3. then (b) calculate the diffusion rate ./. and (c) estimate the average time for a molecule to diffuse in. Assume the diffusion constant is 1 x 10~5m2/s.
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