Calculate the amount of aluminium present in Al ₂( SO ₄)₃ if the compound contains 4 g of sulfur. [Molar mass of sulfur = 32 g/mol , Molar mass of Al =27 g/mol ]

Step-by-step solution

In one mole of Al ₂( SO ₄)₃ , there are 2 moles of Al and 3 moles of S. Mass of Al in 1 mole of compound = 2 27 = 54 g Mass of S in 1 mole of compound = 3 32 = 96 g The ratio of the mass of Al to the mass of S in the compound is 54 96 = 9 16 . Given the mass of S is 4 g, the mass of Al is calculated as: Mass of Al = 4 9 16 = 9 4 = 2.25 g Answer: 2.25 g