Stoichiometry & gases · SL/HL
Percentage yield
Compare actual yield with theoretical yield.
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Number formats & units
Use decimal dots in datasets. Single values also accept decimal commas and scientific notation such as 1.2e-3 or 1.2 × 10⁻³.
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Result & working
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Formula & example
The relationship
What the variables mean
| Symbol | Meaning |
|---|---|
| experimental | Measured amount of desired product. |
| theoretical | Maximum amount predicted from stoichiometry. |
Worked example
- Experimental yield
- 8.2
- Theoretical yield
- 10.0
- Result unit (optional)
- g
82%
Follow the example steps
- Percentage yield = experimental/theoretical × 100
- = 8.2 / 10 × 100 = 82%
Common mistakes
Match the actual and theoretical yield units.
Incorrect approach
500 mg, 1 g: 100 × 500/1
Correct approach
0.5 g, 1 g: 100 × 0.5/1 = 50%
More checks before you submit
- Use matching units and the same definition of product for both quantities.
Method notes
Values above 100% can signal impurities, retained solvent, measurement error or an incorrect theoretical calculation; they are not automatically impossible data.