# Given volume of reagents find the chemical formula of nitrogen oxide

$$\ce{NH3 + O2 -> N_xO_y + H2O}$$

I know that there is $\pu{1 m^3}$ of both the nitrogen oxide and the ammonia and the volume of oxygen on the left side is $\pu{1.25 m^3}$.

I think that I should use the ideal gas equation. It is also obvious that there is only one atom of nitrogen in the oxide - I guess that there is also only one oxygen.

Could anyone give me any hints?