Stoichiometry and Percent YieldA series of free High School Chemistry Video Lessons from Brightstorm.
Stoichiometry 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.
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).
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.
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