C2 AQA Calculations

This is for my benefit, there is only things I do not know in here so not everything from the unit is included, just mainly the harder easy to forget parts.

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Reasons why some methods do not produce 100% yield

-Errors in weighing

-Rectants have formed some impurities

-Some of the reactants lost (for example as a gas)

-Not all of reactants converted to product

    Percentage yield= mass of product formed / maximum mass of product  

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Empirical formula

The empirical formula of a compound or molecule is its elements in the most simple ratio.

To work out the empirical formula

1. Divide mass or % given by Mr of each element.

2. Use the smallest answer, and divide your previous answers by this number.

3.Write the empirical formula as a ratio

EG/ C6H20

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