can someone please help me with this asap?

Question

2. Nitrogen(N2) and oxygen(O2) react to form nitrogen dioxide(NO2). If the reaction vessel initially contains 4.0 moles of nitrogen and 5.0 moles of oxygen, describe the contents (in terms of moles present) after the reaction is complete.  

Answer 1

In the reaction we see that the ratio of N₂ moles to O₂ moles is 1:2. If we use the available (given) moles of these two gases, we see that the O₂ is the limiting reactant and will all be used up. This will produce 5 moles of NO₂ and use up 2.5 moles of the N₂, leaving 1.5 moles unreacted.

So, the contents in the reaction vessel will be: 5 moles of NO₂ and 1.5 moles of N₂