Limiting Reactants and Percent Yield

Let s return to our pancake analogy to xmderstand two more concepts important in reaction stoichiometry limiting reactant and percent yield. Recall our pancake... 

Chapter 9, Chemical Quantities in Reactions, describes the mole and mass relationships among the reactants and products and provides calculations of limiting reactants and percent yields. A section on Energy in Chemical Reactions completes the chapter. 

Chemical stoichiometry is the area of study that considers the quantities of materials in chemical formulas and equations. Quite simply, it is chemical arithmetic. The word itself is derived from stoicheion, the Greek word for element and metron, the Greek word for measure. When based on chemical formulas, stoichiometry is used to convert between mass and moles, to calculate the number of atoms, to calculate percent composition, and to interpret the mole ratios expressed in a chemical formula. Most topics in chemical arithmetic depend on the interpretation of balanced chemical equations. Mass/mole conversions, calculation of limiting reagent and percent yield, and various relationships among reactants and products are commonly included in this topic area. 

Determine which of two reactants is the limiting reactant (Section 4.4). Explain the differences among actual yield, theoretical yield, and percent yield,... 

Skill 2.1b-Calculate the masses of reactants and products, and percent yield using balanced chemical equations, including problems with a limiting reagent... 

Making Pancakes Relationships between Ingredients 250 8.5 More Pancakes Limiting 8.7 Reactant, Theoretical Yield, and Percent Yield 257 Enthalpy A Measure of the Heat Evolved or Absorbed in a Reaction 264 ... 

More Pancakes Limiting Reactant, Theoretical Yield, and Percent Yield 257 SOLUTION... 

Limiting Reactant, Theoretical Yield, and Percent Yield The limiting reactant in a chemical reachon is the reactant that limits the amount of product that can be made. The theoretical yield in a chemical reaction is the amount of product that can be made based on the amount of the limihng reactant. The actual yield in a chemical reachon is the amount of product actually produced. The percent yield in a chemical reaction is the actual yield divided by theorehcal yield times 100%. 

LIMITING REACTANT, THEORETICAL YIELD, AND PERCENT YIELD... 

A chemist allows 14.4 g of CaO and 13.8 g of CO2 to react. When the reaction is finished, the chemist collects 19.4 g of CaCOs. Determine the limiting reactant, theoretical yield, and percent yield for the reaction. 

---