Question: a. How many molecules strike a 1.00-cm 2 surface during 1 min if the surface is exposed to O 2 at 1.00 atm and 298

a. How many molecules strike a 1.00-cm2 surface during 1 min if the surface is exposed to O2 at 1.00 atm and 298 K?

b. Ultra-high-vacuum studies typically employ pressures on the order of 10–10 Torr. How many collisions will occur at this pressure at 298 K?

For O2, M = 0.0320 kg mol–1 and Zc = PNA / (2πMRT) 1/2

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