2KMnO4 + 10FeSO4 + 8H2SO4 → K2SO4 + 2MnSO4 + 5Fe2(SO4)3 + 8H2O
316 g of potassium permanganate was used with 1520 g of iron (II) sulphate
∴ 15.8 g. of potassium permanganate will be used with 1520\over316 × 15.8
= 76 g of iron (II) sulphate
Hence, 76 g of iron (II) sulphate was used.