Quantitative chemistry Flashcards
1
Q
What is the Avogadro’s constant?
A
6.02 x 10^23
2
Q
What are the two reasons the mass may change in a reaction?
A
- one of the reactants is a gas that is found in the air and the products are solids, liquids or aqueous- gas in air become part of product
OR - one of the products is a gas and all the reactants are solids, liquids or aqueous- gas can escape
3
Q
Why is high atom economy good?
A
- less waste
- profitable
- makes useful ‘by-products’
4
Q
Why are yields always less than 100%
A
- not all reactants react to make a product
- there might be side reactions
- you lose some product when you separate it from the reaction mixture
