5. Formula and amounts (YIELD + ECONOMY) Flashcards
1
Q
What is a percentage yield
A
The amount of product you get from the reaction.
2
Q
Give the equation to calculate percentage yield
A
Actual yield / theoretical yield
x 100
3
Q
Why is actual yield ALWAYS LESS than theoretical yield
A
- side reactions
- incomplete reaction
- impurities
- loss of product in apparatus
4
Q
What is atom economy
A
A measure of how many atoms (in terms of atomic mass) in reactants end up in your desired product.
measures EFFCIENCY wheras percentage yeild does not
5
Q
Give the equation to calculate atom economy
A
Mr of desired products / Mr of all reactants
x 100
6
Q
Give 2 reasons why having a higher atom economy ( closer to 100%) is good
A
More efficient so less wastage
Less by product
