Question

Al2(so4)3 contain 3.2 gm of sulphur. then weight of al in sample is??

Answer 1

3 x 32 grams of Sulphur is present in 1 mole of Al₂(SO₄)₃

So, 3.2 grams of Sulphur is present in ¹/₃₀ moles of Al₂(SO₄)₃

We, know each mole of Al₂(SO₄)₃ contains 2 moles of Al

So ¹/₃₀ moles of Al₂(SO₄)₃ contains ¹/₁₅ moles of Al

Mass of ¹/₁₅ moles of Al = 27 x ¹/₁₅ = 1.8 grams

Therefore, mass of Al in the sample is 1.8 grams.

Hope it helps!!