Stoichiometry and Percent Yield

A series of free High School Chemistry Video Lessons.

In this lesson, we will learn

  • Stoichiometry
  • Percent Yield
  • Limiting Reactants



Stoichiometry is the study of measuring or predicting the amount of reactants or products in a chemical reaction based on the variables such as the mass of reactants or products, the limiting reactant and the balanced chemical equation.

 How to use stoichiometry to work with chemical equations.



Stoichiometry problem where we have a limiting reagent



Percent Yield
Reactions don’t always go to completion. In the lab, chemists usually produce less reactants than anticipated. We represent the amount we produced as percent yield, which represents the percent of the anticipated yield we actually produced. The formula for percent yield is percent yield = 100 x absolute value (actual yield / predicted yield).

How to find percent yield for chemical experiments.



Demonstrates how to determine the expected or ideal amount of a product in a chemical reaction and how to use that amount, along with the actual value found in the lab, to calculate percent yield.



Limiting Reactants
Limiting reactants are reactants in chemical reactions which limit how much product can be formed. The limiting reactant is the reactant we run out of first, leaving the other reactants in excess. When predicting how much product we anticipate producing, we have to take the limiting reactant into account.

 Understanding how limiting reactants affect chemical reactions.



Stoichiometry problem where we have a limiting reagent



Limiting Reactant Example Problem




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