formulas Flashcards
1
Q
how to find mass from mr and moles
A
Mass = Mr x number of Moles
2
Q
how to find moles for compounds?
A
Moles = Mass / Mr
3
Q
avogadro’s constant?
A
6.02 x 10^23
4
Q
How is the percentage yield of a product in a chemical reaction calculated?
A
% Yield =
Actual mass of a product
÷
Maximum theoretical mass of product
x 100%
5
Q
the two formulae that link concentration, mass and
volume together?
A
Concentration (g/dm3) = Mass (g) ÷Volume (dm3)
Concentration (mol per dm3) = nr of moles/volume (dm3)
6
Q
how to find the number of moles in an element?
A
mass
÷
relative atomic mass Ar
7
Q
how to find the number of moles in a compound?
A
mass
÷
relative formula mass Mr
8
Q
how to work out atom economy?
A
mr of desired products
÷
sum of mr of all reactants
x 100
