Please solve Chemistry?

[Tom R]

1.Consider the reaction of nitrous oxide N2O with oxygen O2 to form nitrogen dioxide NO2 :
2N2O(g) + 3O2(g) -> 4NO2(g)
Suppose that a 6.0 liter vessel contains N2O gas at 4.0 atm pressure. Suppose that a second vessel, 3.0 L in volume contains oxygen at 6.0 atm pressure. Now suppose that the two vessels are connected by a pipe of negligible volume and the two gases mix and react to produce as much nitrogen dioxide as possible. Assume that the temperature remains constant. What is the pressure in the apparatus at the end of the reaction?

2.If argon diffuses through a porous barrier at the rate of 2.7 mol/min, at what rate would nitrogen diffuse? Assume that the gases behave ideally.

3.How many unit cells share an edge of one unit cell in a face-centered cubic crystalline metallic lattice? Enter zero or a whole number