Percent Yield Formula:
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Definition: Percent yield measures the efficiency of a chemical reaction by comparing the actual amount of product obtained to the theoretical maximum.
Purpose: It helps chemists evaluate reaction efficiency, identify potential problems, and optimize reaction conditions.
The calculator uses the formula:
Where:
Explanation: The ratio of desired product to total converted reactant gives the reaction efficiency as a percentage.
Details: High percent yields indicate efficient reactions, while low yields may suggest side reactions, incomplete reactions, or product loss during purification.
Tips: Enter the moles of reactant converted to desired product and total moles of reactant converted. Both values must be > 0 and desired product ≤ total converted.
Q1: What's considered a good percent yield?
A: While 100% is ideal, yields above 90% are excellent, 70-90% are good, and below 50% may need optimization.
Q2: Why might percent yield exceed 100%?
A: This usually indicates impurities, incomplete drying, or measurement errors. True yields >100% are impossible.
Q3: How is this different from theoretical yield?
A: Theoretical yield is the maximum possible amount, while percent yield compares actual to theoretical.
Q4: Does this account for stoichiometry?
A: You should input values that already consider stoichiometric coefficients from the balanced equation.
Q5: How can I improve percent yield?
A: Optimize temperature, concentration, catalysts, reaction time, and purification methods.