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← Some Basic Concepts of Chemistry
GK QUESTION#3546

One mole of aluminium sulphate, Al₂(SO₄)₃, contains how many moles of oxygen atoms?

  1. A3 moles of oxygen atoms
  2. B6 moles of oxygen atoms
  3. C4 moles of oxygen atoms
  4. D12 moles of oxygen atomsCorrect answer
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Answer

D. 12 moles of oxygen atoms

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Explanation

Each formula unit of Al₂(SO₄)₃ contains three sulfate groups, and each sulfate group has four oxygen atoms. Therefore there are 3 × 4 = 12 oxygen atoms per formula unit. One mole of aluminium sulfate consequently contains 12 moles of oxygen atoms.

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