1
Q
relative atomic mass
A
sum (isotope abundance x isotope mass number)
———————————————
sun of abundance’s of all isotopes
2
Q
percentage mass of an element in a compound
A
ar x number of atoms of element
———————————————
mr of compound
x 100
3
Q
moles
A
mass/mr
4
Q
concentration
A
mass of solute / volume of solvent
5
Q
rate of reaction
A
amount of reactant used or product formed/ time
6
Q
Rr
A
distance travelled by substance / distance travelled by solvent
