JEE Main 2025 Chemistry question
When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is . (Nearest integer) Given : Molar mass of Al is 27.0 g mol Molar mass of O is 16.0 g mol
Answer: 153
Solution
4Al+3O₂→2Al₂O₃. Al=3 mol, O₂=4 mol; Al is limiting. Moles Al₂O₃ = 1.5, mass = 1.5×102 = 153 g.