\[Y=\frac{m_{actual}}{m_{th}}\times100\]
Variables
Ypercent yield (%)
mactactual product mass obtained (g)
mththeoretical product mass (g)
Description
What is this formula?
Percent yield compares the actual amount of product obtained in a chemical reaction with the theoretical maximum amount predicted by stoichiometry.
When to use it
Use this formula after a reaction has been completed to evaluate reaction efficiency, product recovery, or losses caused by incomplete conversion, side reactions, purification, or handling.
Example
Given:
Actual product mass = 7.8 g
Theoretical product mass = 10.0 g
Formula:
Y = (mactual / mth) × 100
Substitution:
Y = (7.8 / 10.0) × 100
Result:
Y = 78%
The reaction produced 78% of the theoretical maximum product.
Applications
Laboratory synthesis
Industrial chemical production
Reaction optimization
Quality control
Process efficiency analysis