# C2(i) - Bonding and Reactions 16.

- Created by: Alice Ugg-Boots
- Created on: 18-05-11 18:50

**Percentage Yield.**

Percentage yield tells you about the **overall success** of an experiment. It compares what you think you should get (**predicted yield**) with what you get in practice (**actual yield**).

**Percentage Yield Compares Actual and Predicted Yield.**

The more reactants you start with, the higher the **actual yield** will be. But the **percentage yield doesn't** depend on the amount of reactants you started with, it's a **percentage**.

1) The **predicted yield** of a reaction can be calculated from the **balanced reaction equation**.

2) Percentage yield is given by the formula:

**Percentage Yield = actual yield (grams) / predicted yield (grams) x 100**

3) Percentage yield is **always** somewhere between **0 and 100%**.

4) A 100% percentage yield means that you got **all** the product you expected to get.

5) A 0% yield means that **no** reactants were converted into product, i.e. no product at all was **made**.

**Yields Are Always Less Than 100%.**

In real life you **never** get 100% percentage yield. Some product or reactant **always** gets lost along the way and that goes for…

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