Calculate Percentage Yield
2 guided lessons · 18 checks · 1. Principles of Chemistry → Chemical Formulae, Equations, Calculations
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Actual and Theoretical Yield
The yield of a reaction is the amount of product you actually obtain. In practice no chemical process ever reaches a complete conversion, because some reactant stays stuck to equipment, some products are lost while being cleaned up, and some reactions run backwards. This lesson names each of those losses and separates what was measured from what was promised.
What you know already
The earlier notes in this subtopic showed how to turn a balanced equation and a starting mass into the mass of product a reaction could theoretically deliver. This note asks how much of that promised product a real experiment actually delivers, names the reasons real reactions fall short, and gives you the comparison sum chemists use to score the difference.
Key points of understanding
- Yield describes the amount of product obtained from a reaction.
- Real reactions never deliver the full predicted amount, for several distinct reasons.
- Some reactants stay behind in the equipment and some product is lost during separation, purification and transfer between containers.
- In reversible reactions the products keep turning back into reactants, so a high yield is never possible.
- Side reactions happen when something extra reacts, such as a gas from the air or an impurity mixed into a reactant.
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1.Actual and Theoretical Yield
The yield of a reaction is the amount of product you actually obtain. In practice no chemical process ever reaches a complete conversion, because some reactant stays stuck to equipment, some products are lost while being cleaned up, and some reactions run backwards. This lesson names each of those losses and separates what was measured from what was promised.
Key points
- Yield describes the amount of product obtained from a reaction.
- Real reactions never deliver the full predicted amount, for several distinct reasons.
- Some reactants stay behind in the equipment and some product is lost during separation, purification and transfer between containers.
- In reversible reactions the products keep turning back into reactants, so a high yield is never possible.
- Side reactions happen when something extra reacts, such as a gas from the air or an impurity mixed into a reactant.
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