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Percent Yield Formula:
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Percent yield is a measure of the efficiency of a chemical reaction. It compares the actual amount of product obtained from an experiment to the theoretical maximum amount that could be produced based on stoichiometric calculations.
The calculator uses the percent yield formula:
Where:
Explanation: The formula calculates the percentage of the theoretical yield that was actually obtained in the experiment.
Details: Percent yield is crucial for evaluating reaction efficiency, optimizing reaction conditions, and assessing the economic viability of chemical processes in both laboratory and industrial settings.
Tips: Enter the actual yield and theoretical yield in grams. Both values must be positive numbers, with theoretical yield greater than zero.
Q1: What is a good percent yield?
A: In organic chemistry, yields of 70-90% are generally considered good, while yields above 90% are excellent. However, this varies depending on the reaction type and complexity.
Q2: Why is percent yield less than 100%?
A: Percent yield is typically less than 100% due to incomplete reactions, side reactions, product loss during purification, measurement errors, or experimental techniques.
Q3: Can percent yield exceed 100%?
A: While theoretically impossible, yields over 100% can occur due to impurities in the product, incomplete drying, or measurement errors.
Q4: How does percent yield differ from atom economy?
A: Percent yield measures experimental efficiency, while atom economy calculates theoretical efficiency based on molecular weights of reactants and desired products.
Q5: What factors affect percent yield?
A: Reaction conditions, purity of reactants, catalyst efficiency, temperature control, and purification methods all significantly impact the final percent yield.