What is the relative formula mass of sodium chloride?
58.5
Relative formula mass (Mr) is found by adding together the relative atomic masses (Ar) of all the atoms present in a compound.
Sodium Chloride is NaCl.
The relative atomic masses can be found in the periodic table.
Ar of Na: 23
Ar of Cl: 35.5
Mr of NaCl: 23 + 35.5 = 58.5
