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Chemistry

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Chemistry

Percent Yield Calculator.

Calculates the percent yield of a chemical reaction from actual and theoretical yields.

Results update live as you type.
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Your inputs

How it works

  1. 1

    Enter the actual yield you obtained from the experiment.

  2. 2

    Enter the theoretical yield calculated from stoichiometry.

  3. 3

    Divide actual yield by theoretical yield.

  4. 4

    Multiply by 100 to get the percent yield.

(actual_yield / theoretical_yield) * 100

Frequently asked questions

What does percent yield tell me?

It indicates the efficiency of a reaction, comparing the amount of product actually obtained to the maximum possible amount.

Can percent yield be over 100%?

Yes, it can happen due to impurities, incomplete drying, or measurement errors, but it usually indicates an issue.

What if theoretical yield is zero?

The calculator requires a positive theoretical yield; if it's zero, the reaction is not defined.

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Results

Formula checked

Percent Yield

85%

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Estimate for general guidance only — verify important decisions with an appropriate professional.

How it works

Calculates the percent yield of a chemical reaction from actual and theoretical yields.

  1. Enter the actual yield you obtained from the experiment.
  2. Enter the theoretical yield calculated from stoichiometry.
  3. Divide actual yield by theoretical yield.
  4. Multiply by 100 to get the percent yield.

Formulas

The math behind this calculator, written out so you can verify the result.

Percent Yield Formula

Percent Yield = (Actual Yield / Theoretical Yield) × 100%

This formula expresses the efficiency of a chemical reaction as a percentage.

Example:

Input: Actual = 8.5 g, Theoretical = 10.0 g

Calculation: (8.5 / 10.0) × 100

Result: 85%

Real-world use cases

Where this calculation shows up in everyday life.

Lab Experiment Evaluation

Assess how well your synthesis or reaction performed compared to the ideal.

Example: A student obtains 8.5 g of aspirin when the theoretical yield is 10 g.

Process Optimization

Identify inefficiencies in industrial chemical processes to improve yields.

Example: Compare yields across different reaction conditions.

Quality Control

Verify that a product meets expected purity and yield standards.

Example: Check if a batch meets the 90% yield target.

Tips and common mistakes

Tips

  • Ensure both yields are in the same units (e.g., grams).
  • Use the limiting reagent to calculate theoretical yield accurately.
  • Dry the product completely before weighing to avoid excess mass.
  • Run multiple trials and average the percent yields for reliability.

Common Mistakes to Avoid

  • Using the wrong units for actual and theoretical yields.
  • Forgetting to convert moles to grams when calculating theoretical yield.
  • Not accounting for side reactions that reduce the actual yield.

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.