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At 20C and 750 torr pressure, the mean free paths for argon gas(Ar) and nitrogen gas(N) are lambdaAr = 9.9 x 10^-6 cm and lambdaN2 = 27.5 x 10^-6 cm.

a) Find the ratio of the diameter of Ar atom to that of an N2 Molecule.

b) What is the mean free path of argon at 20oC and 150 torr and...

c) .... -40oC and 750 torr?

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