ChemistryThe chief ore of zinc is the sulfide, ZnS. The ore is concentrated by a froth floatation process and then heated in air, which converts the ZnS to ZnO.2ZnS + 3O₂ → 2ZnO + 2SO₂ (75%  conversion)ZnO + H₂SO₄  → ZnSO₄ + H₂O (100% conversion ) 2ZnSO₄ + 2H₂O → 2Zn + 2H₂SO₄ + O₂ (80%  conversion)The mass of Zn obtained from a sample of ore containing 292.2 kg of ZnS will be :

The chief ore of zinc is the sulfide, ZnS. The ore is concentrated by a froth floatation process and then heated in air, which converts the ZnS to ZnO.

2ZnS + 3O₂ → 2ZnO + 2SO₂ (75%  conversion)

ZnO + H₂SO₄  → ZnSO₄ + H₂O (100% conversion )

2ZnSO₄ + 2H₂O → 2Zn + 2H₂SO₄ + O₂ (80%  conversion)

The mass of Zn obtained from a sample of ore containing 292.2 kg of ZnS will be :

  1. A
    117.72 kg
  2. B
    214.62 kg
  3. C
    145.23 kg
  4. D
    166.55 kg 

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    Solution:

    2ZnS + 3O₂  2ZnO + 2SO₂
    ​2ZnO + 2H₂SO₄  2ZnSO₄ ​+ 2H₂O
     2ZnSO₄ + 2H₂O 2Zn + 2H₂SO₄ + O₂
    ​It can be observed that one mole of ZnS gives 1 mole of Zn.
    The molar masses of Zn and ZnS are 65.37 g/mol and 97.47 g/mol.
    The mass of zinc that can be obtained from
     292.2 kg of ZnS is 65.3797.44 × 292.2 ×75100 × 100100 ×80100 =117.72 kg.
     
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