Limiting reagents

Limiting reagents is a concept that is easy to understand in one context... but tricky to understand in another. Before I expand on this statement, what do I mean by limiting reagents? Well, unless you have some super precise mass balances, when carrying out a chemical reaction you will always add too many atoms / molecules / particles of one substance and not enough of the other. The one that you have added too much of is the reagent that is ...