Ammonium Sulphate: Molecular formula:(NH4)2SO4 Molecular weight :132.13 Properties: colorless crystal or white crystalline powder Uses: used in metallurgy, medicine, leather, wood preservative, textile, plating, ferment, and fertiliser. Specification:N: 20.5% min. Moisture: 0.3% max. Free Acid (as H2SO4): 0.05% max.