Percentage Yield Simplified Revision Notes for GCSE Edexcel Chemistry Combined Science

Revision notes with simplified explanations to understand Percentage Yield quickly and effectively.

Learn about Percentage yield for your GCSE Chemistry Combined Science Exam. This Revision Note includes a summary of Percentage yield for easy recall in your Chemistry Combined Science exam

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3.3.1 Percentage Yield

What is "Percentage Yield?

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Percentage yield tells us how much of the reactants have been successfully turned into products in a chemical reaction. It compares what you actually get (the actual yield) to the maximum amount you could have gotten (the theoretical yield).

Why Don't We Always Get 100% Yield?

In theory, if you start with 10 grams of reactants, you should get 10 grams of product. But in real life, this almost never happens because:
- Some reactions are reversible, meaning they don't go all the way to completion.
- Some product might be lost during separation from the reaction mixture.
- Some reactants might react in unexpected ways (e.g., reacting with oxygen in the air instead of with other reactants).

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How to Calculate Percentage Yield:

The formula for percentage yield is:

Percentage Yield=(\frac{Theoretical Yield}{Actual Yield})×100

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Example:

Imagine you perform an experiment and produce 6.25 g of magnesium sulfate, but the maximum amount you could theoretically get is 8.5 g.
Using the formula:

Percentage Yield=(\frac{6.25}{8.5 })×100=73.5%

So, in this example, your percentage yield is 73.5%, meaning you successfully converted 73.5% of the reactants into the product.

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