7. How many molecules strike a 5 cm2 surface during 30 sec if the surface is exposed to N2 at 2.0 atm and 323K? And under this situation how many collisions will occur at 
torr?
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7. How many molecules strike a 5 cm2 surface during 30 sec if the surface is exposed to N2 at 2.0 atm and 323K? And under this situation how many collisions will occur at torr?