One mole of Aluminium Sulphate Al2(SO4)3 contains:

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SSC CPO 2024 Official Paper-I (Held On: 28 Jun, 2024 Shift 3)
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  1. 4 moles of oxygen atoms
  2. 3 moles of oxygen atoms
  3. 12 moles of oxygen atoms
  4. 6 moles of oxygen atoms

Answer (Detailed Solution Below)

Option 3 : 12 moles of oxygen atoms
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The correct answer is 12 moles of oxygen atoms

Key Points

  • One mole of Aluminium Sulphate Al2(SO4)3 contains 12 moles of oxygen atoms.
  • To determine this, we analyze the chemical formula Al2(SO4)3.
  • Each sulphate ion (SO42-) contains 4 oxygen atoms.
  • In Al2(SO4)3, there are 3 sulphate ions.
  • Thus, the total number of oxygen atoms is calculated as 3 (sulphate ions) × 4 (oxygen atoms per sulphate ion) = 12 oxygen atoms.
  • This matches the provided answer of 12 moles of oxygen atoms in one mole of Aluminium Sulphate.

Additional Information

  • Aluminium Sulphate is commonly used in water purification, paper manufacturing, and as a mordant in dyeing and printing textiles.
  • It is also used in the food industry as a firming agent.
  • The molecular weight of Aluminium Sulphate Al2(SO4)3 is approximately 342.15 g/mol.
  • When dissolved in water, it dissociates into aluminium ions (Al3+) and sulphate ions (SO42-).
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