gc textbook chapter 13 temperature and kinetic theory (id: 2b95ef221)

本题目来源于试卷: gc textbook chapter 13 temperature and kinetic theory，类别为 通用国际物理

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Oxygen diffuses from the surface of insects 5rbw/x,)ky6s n6 cgf ato the interj 9kkx+w rw1o 96i-rurior through tiny tubes called tracheae. An average trachea is about 2 mm long and has cross-sectionao9k ikr+jw9- 1 xruw6rl area of $ 2\times10^{-9 } m^2$ 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 20$^{\circ} $ C is about 8.7 mol/$m^3$ then $\approx$    mol/$m^3$(Round to one decimal places)
(b) calculate the diffusion rate J,    $ \times10^{-11 }$ mol/s
(c) estimate the average time for a molecule to diffuse in. Assume the diffusion constant is $ 1\times10^{-5 } m^2/s$    s

参考答案:
空格1: 8.7±2%  空格2: 4.366±2%  空格3: 0.6±2% 


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