3.3.1 Percentage yield
Percentage yield
For a Stage 2 reaction the percentage yield was 92.3% The theoretical maximum mass of titanium produced in this batch was 13.5 kg. Calculate the actual mass of titanium produced. (2)
Factors that affect % yield
- Not all reactant is reacted
- Some product is lost when separated from reaction mixture
- Unexpected reaction
3.3.2 Atom economy
Why is it important for percentage of atom economy of a reaction to be as high as possible (2)
- Important for sustainable development
- Economic reasons
- Waste products may be pollutants
Different results – additional product is made e.g. CO2, H2O