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JAMB Chemistry 1979 Question 21

Question 21

Chemical Formulae and Equations

The empirical formula of an oxide of nitrogen containing 30.4 per cent of nitrogen is (N = 14.0, O = 16.0)

  1. A.N2O2
  2. B.NO
  3. C.NO2
  4. D.N2O
  5. E.N2O3.
Show the answer and explanation

Answer: C (NO2)

Explanation

N: 30.4/14 = 2.17; O: 69.6/16 = 4.35. Dividing by 2.17 gives N:O = 1:2, so NO2.