The formula of aluminium sulfate is Al2(SO4)3. Calculate the total number of atoms that combine to form 5.13 g of aluminium sulfate. (relative atomic masses: O = 16.0, Al = 27.0, S = 32.0 Avogadro number = 6.02 × 1023) – 9003

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1. Calculate the formula mass of Al₂(SO₄)₃:
   = 2 × 27 + 3 × (32 + 4 × 16)
   = 54 + 3 × 96
   = 54 + 288 = 342
   Moles of Al₂(SO₄)₃ = 5.13 ÷ 342 = 0.015 mol
   Number of atoms in one formula of Al₂(SO₄)₃ =
   2 Al + 3 × (1 S + 4 O) = 2 + 3 × 5 = 17 atoms
   Number of atoms in 0.015 mol =
   17 × 0.015 × 6.02 × 10²³ = 1.5351 × 10²³ atoms

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