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1) how many oxygen molecules travelling at this speed (i already have the speed calculated) are necessary to produce an average pressure of 1.00 atm?

2) calculate the number of oxygen molecules that are actually contained in a vessel of this size (cubical with sides of 0.10m) at 300K and atmospheric pressure.

the problem is that i don't understand the difference between the two questions. i wanted to use PV=2/3NKav for one but i don't know which one or what to use for the other. It also says that the answer to 2 should be 3 times the size of 1. I find this very confusing. Could anyone try and explain the difference to me? Thanks