Excess and Limiting Reactants Percent Yield

One reactant is the excess quantity and some of it will be lefy over. The second reactant is used up completely, and is the limiting reactant.

Here's the step to find the excess and limiting reactants:
Step1. Balanced equation
Step2. Convert one to another

and then you can find which one is left over. The one has more is excess reactants and the one that has less is limiting reactants

Here's a video that show an example and clearly explain about excess reactants and limiting reactants: