10. How many grams of NH 3 can be produced when 67.2 L of nitrogen, , are used? Assume you have N 2 hydrogen in excess. Be sure to balance the reaction. 12. A chemistry student reacts solid magnesium and hydrochloric acid together in a flask (equation below). A universal pH indicator (turns solution pink when acid present) was placed in the flask with the hydrochloric acid, and then the magnesium was dropped in the hydrochloric acid. Given the student's data/ observations below, what conclusion can be made regarding what the limiting and excess reactant was in this experiment?