Relative Formula Mass

1
Relative Formula Mass

• This is the total mass of the sum of all the
  relative atomic masses of the elements in a
  compound.

2
What will you need to do?

• Calculate the relative formula mass of compounds
  whose formulae are supplied.

• Calculate the percentages of elements in
  compounds whose formulae are supplied.

3
Calculate the Relative Formula Mass of compounds
whose formulae are supplied.

• CO2

Carbon Dioxide
Carbon C 12 Oxygen O 16
Carbon Dioxide CO2 12 216 44
Relative formula mass of Carbon Dioxide 44
4
Here are some examples.
H2
2

• H2O

18
FeO
72
100
CaCO3
5
Calculate the percentages of elements in
compounds whose formulae are supplied.

• H2O

Water
Oxygen 116 16
Hydrogen 21 2
Relative formula mass H2O 2116 18
Hydrogen 2/18100 11
Oxygen 16/18100 89
6
Here are some examples

• CO2

H2SO4
CuSO4
NaCl