Why the moon is the barycenter of earth?

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus

In the diagram here that represents the reaction, which reactant, a or b, is the limiting reagent?