Home
Back
Percentage Yield Formula:
| From: | To: |
Percentage yield is a measure of the efficiency of a chemical reaction, comparing the actual amount of product obtained to the maximum possible amount (theoretical yield) that could be produced under ideal conditions.
The calculator uses the percentage yield formula:
Where:
Explanation: The formula calculates what percentage of the theoretically possible product was actually obtained in the reaction.
Details: Percentage yield is crucial for evaluating reaction efficiency, optimizing chemical processes, calculating economic viability, and identifying potential sources of product loss in chemical reactions.
Tips: Enter both actual and theoretical yields in grams. Both values must be positive numbers, with theoretical yield greater than zero.
Q1: What is a good percentage yield?
A: In organic chemistry, yields of 90-100% are considered excellent, 80-90% are very good, and 70-80% are good. However, acceptable yields vary by reaction type.
Q2: Why is percentage yield never 100%?
A: Percentage yield is rarely 100% due to incomplete reactions, side reactions, product loss during purification, and measurement errors.
Q3: Can percentage yield exceed 100%?
A: In theory, no. If calculated yield exceeds 100%, it typically indicates impurities in the product, measurement errors, or incorrect theoretical yield calculation.
Q4: How does percentage yield differ from atom economy?
A: Percentage yield measures efficiency of a specific reaction, while atom economy measures how efficiently atoms are used in a reaction overall.
Q5: What factors affect percentage yield?
A: Factors include reaction completeness, competing side reactions, purification losses, measurement accuracy, and experimental technique.