1. What is Percent Yield?

Percent yield is a measure of the efficiency of a chemical reaction. It compares the actual yield (what you actually obtain from the reaction) to the theoretical yield (the maximum possible amount of product).

2. How Does the Calculator Work?

The calculator uses the percent yield formula:

Where:

• Actual Yield — The amount of product actually obtained from the reaction (in grams)
• Theoretical Yield — The maximum possible amount of product calculated from stoichiometry (in grams)

Explanation: The formula shows what percentage of the theoretical maximum you actually obtained in your experiment.

3. Importance of Percent Yield

Details: Percent yield helps chemists evaluate the efficiency of reactions, identify potential problems in experimental procedures, and optimize reaction conditions.

4. Using the Calculator

Tips: Enter both actual and theoretical yields in grams. Both values must be positive numbers. The theoretical yield should be calculated from stoichiometric equations before using this calculator.

5. Frequently Asked Questions (FAQ)

Q1: What is a good percent yield?
A: While 100% is ideal, yields above 90% are excellent, 80-90% are good, and below 70% may indicate problems with the reaction or technique.

Q2: Why might percent yield be over 100%?
A: This could indicate impurities in the product, incomplete drying, or errors in theoretical yield calculation.

Q3: How do I calculate theoretical yield?
A: Use stoichiometry based on the limiting reactant, molar masses, and the balanced chemical equation.

Q4: What factors affect percent yield?
A: Reaction completeness, side reactions, purification losses, measurement errors, and experimental technique all affect yield.

Q5: Should percent yield be high or low?
A: Higher is generally better, indicating more efficient conversion of reactants to desired product.