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What is the mean free path of molecules, in nanometer, in an ideal gas in which the mean collision time is 2 X 10'10 s,

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What is the mean free path of molecules, in nanometer, in an ideal gas in which the mean collision time is 2 X 10'10 s, the temperature is 302 K, and the mass of a molecule is 9 X 10'25 kg? Assume that the molecules are moving at their rootmeansquare speeds. The Boltzmann constant is 1.38 X 10'23 J/K

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