Percent Yield Calculator
Calculate reaction efficiency from actual and theoretical yields
Calculate Percent Yield
Mass of product obtained from experiment
Maximum possible mass based on stoichiometry
Yield Analysis Results
Formula: Percent Yield = (Actual Yield / Theoretical Yield) × 100%
Efficiency Rating: Very Poor
0Yield Interpretation
Example: Acetone Synthesis
Reaction Setup
Reactants:
8 g CaCO₃ + 9 g CH₃COOH
Theoretical yield: 4.35 g acetone
Actual yield: 4.00 g acetone
Calculation
Percent Yield = (4.00 g ÷ 4.35 g) × 100%
Percent Yield = 92.0%
Rating: Excellent
Yield Efficiency Scale
90-100%
Excellent
Highly efficient reaction
80-89%
Very Good
Well-optimized conditions
70-79%
Good
Acceptable efficiency
50-69%
Fair
Needs optimization
<50%
Poor
Major issues present
Common Yield Loss Causes
Incomplete Reaction
Equilibrium limitations
Insufficient reaction time
Side Reactions
Competing pathways
Unwanted byproducts
Physical Losses
Transfer between vessels
Purification steps
Measurement Errors
Weighing inaccuracies
Contaminated products
Optimization Tips
Use excess of limiting reagent
Optimize temperature and time
Minimize transfer steps
Dry products completely
Understanding Percent Yield
What is Percent Yield?
Percent yield is a measure of reaction efficiency that compares the actual amount of product obtained from a chemical reaction to the theoretical maximum amount possible. It indicates how successful a reaction was in converting reactants to products.
Why is it Important?
- •Evaluates reaction efficiency and optimization
- •Identifies problems in experimental procedures
- •Compares different synthetic routes
- •Essential for industrial process economics
Formula and Calculation
Percent Yield = (Actual Yield / Theoretical Yield) × 100%
Actual Yield
The amount of product actually obtained from the experiment
Theoretical Yield
The maximum amount of product possible based on stoichiometry
Note: Yields over 100% indicate impurities or measurement errors. Perfect 100% yields are practically impossible due to unavoidable losses.