The balanced chemical equation, 2no (g) + 5h2 (g) (arrow pointing this way > > ) 2nh3 (g) + 2h2o (g), can be expressed in words as:

nitrogen dioxide gas plus hydrogen gas yields ammonia gas plus water

nitrogen monoxide gas plus hydrogen gas yields ammonia gas plus water vapor

nickel monoxide gas plus hydrogen gas yields nitrogen trihydride plus water

nitrogen oxide gas plus hydrogen gas yields ammonia gas plus water vapor

i think it's either b, or d. i can't figure out which one it is though. .