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JAMB Chemistry 1990 Question 3

Question 3

Mole Concept and Stoichiometry

In the reaction: SnO2 + 2C → Sn + 2CO, the mass of coke containing 80% carbon required to reduce 0.302 kg of pure tin oxide is [Sn = 119, O = 16, C = 12]

  1. A.0.40 kg
  2. B.0.20 kg
  3. C.0.06 kg
  4. D.0.04 kg
Show the answer and explanation

Answer: C (0.06 kg)

Explanation

151 g of SnO2 needs 24 g of carbon, so 0.302 kg needs 0.048 kg of carbon. Coke is only 80% carbon, so mass of coke = 0.048 ÷ 0.80 = 0.06 kg.