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JAMB Chemistry 1983 Question 43

Question 43

Mole Concept and Stoichiometry

A jet plane carrying 3,000 kg of ethane burns off all the gas, forming water and carbondioxide. If all the carbondioxide is expelled and all the water formed is condensed and kept on board the plane, then the gain in weight is

  1. A.1,800 kg
  2. B.900 kg
  3. C.600 kg
  4. D.2,400 kg
  5. E.1,200 kg
Show the answer and explanation

Answer: D (2,400 kg)

Explanation

C2H6 → 3H2O: 30 kg of ethane gives 54 kg of water, so 3,000 kg gives 5,400 kg. The plane loses 3,000 kg of fuel and keeps 5,400 kg of water: a gain of 2,400 kg.