Nitric oxide (NO) reacts with molecular oxygen 2NO(g) + O2(g) → 2NO2(g), Initially, the reactant?

... gases are separated in equal volumes of a 2.0 L container. The pressure of the NO is
1.25 atm, while the pressure of the O2 is 0.85 atm. What are the partial pressures of the gases
once the reaction has gone to completion. Assume the temperature remains constant at 0ºC