Percent Yield and Limiting Reactant Practice

Percent Yield Formula

• Formula: Percent yield = (Actual yield / Theoretical yield) × 100%
• Key Components:
  • Actual yield: the measured amount of product obtained from a reaction.
  • Theoretical yield: the calculated maximum amount of product that can be formed from the given amounts of reactants based on stoichiometry.

Limiting Reactant Concept

• The limiting reactant is the substance that is completely consumed first in a chemical reaction, limiting the amount of product formed.
• To identify the limiting reactant:
  1. Calculate the moles of each reactant.
  2. Use the stoichiometry of the reaction to find out which reactant produces the least amount of product.

Reaction Product Calculation

• To calculate the maximum amount of product produced:
  • Write the balanced chemical equation.
  • Determine the mole ratio from the balanced equation.
  • Use the amount of limiting reactant to calculate the moles of product formed.
  • Convert moles of product to grams if necessary using the molar mass.