Does your answer to the previous question show that the law of conservation of mass was violated? what do you think might cause the mass difference

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

the atomic mass is the bottom number on the element.

-steel jelly