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

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admin 发表于 2025-2-17 19:32:48 | 显示全部楼层 |阅读模式
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 ofyxeltin .38dl1x(3rv insects to the interior wn-)fsyyyr9k (xj 7fel78 52 3xr/+mffsxi knthrough tiny tubes called tracheae. An average trachea is about 2 mm long and has cross-sectional a/-(yffx 72e rjxy7l nwx3k) k+i8ss 9fmnrf5yrea of 2×109m2 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 C is about 8.7 mol/m3 then    mol/m3(Round to one decimal places)
(b) calculate the diffusion rate J,    ×1011 mol/s
(c) estimate the average time for a molecule to diffuse in. Assume the diffusion constant is 1×105m2/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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