Iron (II)
sulfate also known as ferrous sulphate. Its chemical formula is FeSO₄, and
formula weight is the sum of the atomic weights of all atoms that
are present in a given chemical formula.
Molar mass of Fe is 55.8450
g/mol
Molar mass of S
= 32.065 g/mol
Molar mass of
oxygen = 15.999 g/mol
Now add the
masses according to formula:
55.8450 + 32.065
- 4(15.999) = 151.96 is the formula weight of FeSO₄