What is the formula weight of iron(ii) sulfate? answer in units of g/mol.

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

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