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JAMB Chemistry 1990 Question 48

Question 48

Petroleum and Coal

The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4-trimethyl pentane and 45 g of n-heptane is

  1. A.45
  2. B.55
  3. C.80
  4. D.100.
Show the answer and explanation

Answer: B (55)

Explanation

Octane number is the percentage of 2,2,4-trimethylpentane (iso-octane) in a mixture with heptane that performs the same: 55 out of 100 g is 55%.