A sample of NH3(g) and O2(g) are placed in a rigid container. When the equilibrium below is established, the partial pressure of H2O(g) is 0.784 atm. What is the partial pressure of NO(g) when the system is at equilibrium?

it is b that is the answer.

answerambulatory;

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but