Limiting Reagant

A Limiting Reagants is the chemical in a reaction that "runs out" first. To find it you can either calculate and compare the amount of theoretical yields. The compound that results in the smaller of the two values is the Limiting Reagent, while the other method is by multiplying the moles of them by the mole ratio from the equation and the one with less moles is the Limiting Reagent. Here Crash Course discusses them along with Stochiometry. Here is a image showing a simple version of what the chemicals would look like if there is a Limiting Reagent: