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A sample of argon gas is at a pressure of 1.5 x 105 Pa and a temper-
ature of 350 K.
(a) Determine the number of argon atoms per unit volume.
(b) Estimate the speed of the argon atoms between collisions.
(c) Estimate the number of collisions that a single atom of argon
makes per second. The diameter of an argon atom is approxi-
mately 3.4 x 10-10 m.

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