2. How many moles of NO3, will be produced with this amount of oxygen
gas?

The given question is an incomplete question, the complete question is given below.
Use this equation to answer the questions that follow.
[tex]3O_2(g)+N_2(g)\rightarrow 2NO_3(g)[/tex]
5 moles of oxygen gas are present. How many moles of [tex]NO_3[/tex] will be produced with this amount of oxygen gas?
Answer : The moles of [tex]NO_3[/tex] produced will be 3.33 moles.
Explanation : Given,
Moles of oxygen gas = 5 moles
Now we have to calculate the moles of [tex]NO_3[/tex].
The given balanced chemical equation is:
[tex]3O_2(g)+N_2(g)\rightarrow 2NO_3(g)[/tex]
From the balanced chemical equation we conclude that,
As, 3 moles of [tex]O_2[/tex] gas react to produces 2 moles of [tex]NO_3[/tex] gas
So, 5 moles of [tex]O_2[/tex] gas react to produces [tex]\frac{2}{3}\times 5=3.33[/tex] moles of [tex]NO_3[/tex] gas
Therefore, the moles of [tex]NO_3[/tex] produced will be 3.33 moles.