1. What is Reaction Yield?

The reaction yield (also called percent yield) is a measure of the efficiency of a chemical reaction. It compares the amount of product actually obtained (actual yield) to the maximum amount possible (theoretical yield).

2. How Does the Calculator Work?

The calculator uses the yield formula:

Where:

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

Explanation: The yield is expressed as a percentage, with 100% representing a perfect reaction where all reactants are converted to product.

3. Importance of Yield Calculation

Details: Calculating yield helps chemists evaluate reaction efficiency, optimize conditions, and identify potential problems like side reactions or incomplete conversions.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is a good yield in chemistry?
A: Yields above 90% are excellent, 70-90% are good, and below 40% typically need improvement. However, this varies by reaction type.

Q2: Why is actual yield usually less than theoretical?
A: Due to incomplete reactions, side reactions, product loss during purification, or measurement errors.

Q3: Can yield be over 100%?
A: Normally no. If it happens, it suggests impurities, incorrect measurements, or calculation errors.

Q4: How do I calculate theoretical yield?
A: Use stoichiometry: (1) Balance the equation, (2) Convert reactants to moles, (3) Determine limiting reagent, (4) Calculate maximum product possible.

Q5: What's the difference between yield and purity?
A: Yield measures quantity of product obtained, while purity measures how much of that product is the desired compound versus impurities.