The best laboratory vacuum pump can generate a vacuum of about 1 nTorr. At 25 °C and assuming that air consists of N2 molecules with a collision diameter of 395 pm, calculate at this pressure (i) the mean speed of the molecules, (ii) the mean free path, (iii) the collision frequency in the gas.

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A: P = 1 ntorr = 1 x 10-9 torr = 1.33 x 10-7 Pa T = 25oC = 298 K d = 395 pm = 395 x 10-12 m a).…

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