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The mean radius of a molecule of a certain gas is R=0.1 nm , and the...

The mean radius of a molecule of a certain gas is R=0.1 nm , and the molar mass is 18 gram/mole. If pressure P=1.01x105 Pa and temperature T=300K

a) What is the mean free path , λ?

b) If a molecule of the gas has diffused a distance of 12m, what is the number of collisions this molecule has undergone?

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