Calculating Yield
Chemistry: AQA GCSE Higher, topic 3.1.17
Calculating Percentage Yield
The percentage yield of a reaction is calculated as the real yield divided by the theoretical yield multiplied by 100.
Real yield
- The real yield is the mass of a desired product obtained from a reaction.
Theoretical yield
- The theoretical yield is the maximum mass of a product that could possibly be created from a reaction.
- This can be calculated from a balanced equation if we know the mass of the reactants.
Percentage yield
- A comparison of the real and theoretical yields of a reaction.
Test yourself on Calculating Yield
What 2 figures must we know before we can calculate the percentage yield of a reaction?
If we divide the real yield by the theoretical yield and multiply by 100, what is being calculated?
Select the true statement from each pair
What happens to the theoretical yield of a reaction if a chemist increases the mass of reactants used?