Chemistry 11 · Chemistry · Lesson 6.4
Limiting and excess reactants, yield and purity
- Level
- Grade 11
- Reading time
- 11 min reading
- Review
- Last reviewed 2026-09-03
- Standard
- Accuracy standard
- Errata
Abstract
Limiting and excess reactants, percentage yield and percentage purity.
Concept preview
What you will be able to do
- 01Identify the limiting and excess reactants
- 02Calculate the amount of product and of excess reactant
- 03Calculate percentage yield and percentage purity
Reactions are often run with the reactants NOT in the exact coefficient ratio — perhaps to make sure one is completely used up, or because only a limited amount of another is available. The reactant that runs out first is the limiting reactant: it sets a limit on how much product can form. The reactant left over is the excess reactant. All product amounts must be calculated from the limiting reactant.
School Plan
Limiting and excess reactants, yield and purity
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