Yield and atom economy of chemical reactions
0.0(0)
Studied by 1 person
Learn
Practice Test
Spaced Repetition
Match
FlashcardsCard Sorting
1/6
There's no tags or description
Looks like no tags are added yet.
Study Analytics
Name | Mastery | Learn | Test | Matching | Spaced |
|---|
No study sessions yet.
7 Terms
1
New cards
what is atom economy
The atom economy (atom utilisation) is a measure of the amount of starting materials that end up as useful products.
2
New cards
why is atom economy useful
100% atom economy means that all the atoms in the reactant have been turned into useful (desired) products . The higher the atom economy the ‘greener’ the process
* reactions with low atom economy use up resources very quick- they make lots of waste materials that have to be disposed of- this tends to make it unsustainable
* low atom economy’s aren’t profitable- raw materials are often expensive to buy and waste products can be expensive to remove and dispose of responsibly
* reactions with low atom economy use up resources very quick- they make lots of waste materials that have to be disposed of- this tends to make it unsustainable
* low atom economy’s aren’t profitable- raw materials are often expensive to buy and waste products can be expensive to remove and dispose of responsibly
3
New cards
how to calculate atom economy
*Relative formula mass of desired product from equation / sum of relative formula masses of all reactants product from equation* × 100
4
New cards
what is percentage yield
the amount of product you get
the more products you start with the higher the yield
the more products you start with the higher the yield
5
New cards
how to calculate percentage yield
percentage yield = mass of products actually made (g)/ maximum theoretical mass of product
6
New cards
why is percentage yield useful
industrial processes should have as high a percentage yield as possible to reduce waste and reduce cost
\
\
7
New cards
why are yields always less than 100%
yields are always less than 100%- products or reactants always gets lost along the way
1. depends on what appratus and what reaction is occurring
2. there might be side reactions
3. reaction may not go to completion in reversible reactions
4. you lose some products when you separate it from the reaction mixture
1. depends on what appratus and what reaction is occurring
2. there might be side reactions
3. reaction may not go to completion in reversible reactions
4. you lose some products when you separate it from the reaction mixture