3.3 Percentage Yield Flashcards
1
Q
Why is not possible to always produce the maximum theoretical yield of a reaction?
A
- Reaction may not go to completion because it is reversible
- Some of the product may be lost when separated from reaction mixture
- Some of the reactants may react in ways different to expected reaction
1
Q
What is yield?
A
Amount of product obtained
2
Q
How do you calculate the maximum theoretical mass for the reaction?
A
Firstly you need to calculate the number of mols required
Mols= Mass / molar mass
Then balance the equation
Then calculate the maximum theoretical mass using
Mass= Mols x Molar mass
3
Q
What is the equation for percentage yield?
A
Amount of product / Maximum amount of product possible x 100
4
Q
What is atom economy?
A
Formula mass of our useful products (desired products) / Formula mass of all reactants x 100
5
Q
Why do we use atom economy?
A
Important for :
- Sustainable development
- Economic reasons, to use reactions with higher atom economy
