C4 - Moles and chemical calculations Flashcards
1
Q
Formula that links moles, MR/AR and mass
A
Moles = mass(g) / Mr or mass(g) /Ar
2
Q
If Carbon has 12Ar and Oxygen has 16Ar how much Mr is CO2
A
44
3
Q
A mole always contains the same number of of atoms, molecules or ions (known as the Avogadro constant). How much is it?
A
6.02 * 10^23
4
Q
Percentage Yield =?
A
mass of product produced/ maximum mass of product possible *100
5
Q
atom economy =
A
relative formula mass/ sum of relative formula masses of reactants from equation *100
6
Q
Define percentage yield
A
How much you actually make in comparison to the maximum that can be made.
7
Q
Define Atom economy
A
A measure of the amount of starting materials that end up as the desired product.
