Moles

Mole

Avogadro's number of an atom, ion or compound

Formula for moles

Mass(g)/relative formula mass (Mr)

The mass of 1 mole of any substance=

formula mass in grams

mol

Symbol for moles

Value of Avogadro constant

6.02 x 10^23

Avogadro's constant

The number of atoms, molecules or ions in a mole of a given substance

Relative atomic mass

The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12.

Relative formula mass

The relative atomic masses of the elements in a compound added together

Reacting mass

The amount of one reactant needed to react exactly with another reactant.

Link between moles and equations

Multipliers show you the ratio of moles in a reaction

Reagent

Reactant

Limiting reactant (limiting reagent)

A reactant that is totally used up so it determines the amount of product formed.

Excess

More than is required to react with the limiting reactant

1 kg

1000 g

1 tonne

1000 kg