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

a) How many molecules strike a 1 cm2 surface during 1min if the surface is exposed to O2 at 1 atm and 298 K? b) Ultrahigh vacuum studies typically employ pressures on the order of 10-10 Torr. How many collisions will occur at this pressure at 298 K?

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