Mole concept Flashcards
1
Q
n
A
symbol for amount
2
Q
NA
A
Avogadro’s number
6.02x10^23 particles in one mole
3
Q
n=
A
N/NA
4
Q
N
A
number of particles
5
Q
Mr
A
Relative molecular mass
sum of the rams of the elements in the molecular formula
6
Q
m=
A
n x Mr
7
Q
Relationship for mole ratio
A
n(unknown)=coefficient(unknown)/coefficient(known) x n(known)
8
Q
% of an element
A
(RAM x the number of atoms of that element/Mr of the compound) x 100
9
Q
EF
A
if composition of each atom is not given…
convert mass ratios to mole ratios (n=m/Mr)
Find the smallest whole number of moles ratio of an atom
10
Q
MF
A
find molar mass of the compound
find empirical formula mass
use this:Mr(MF)=EF mass x X
