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JAMB Chemistry 1999 Question 8

Question 8

Chemical Formulae and Equations

A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of the chloride is [M = 27, Cl = 35.5].

  1. A.MCl
  2. B.MCl2
  3. C.MCl3
  4. D.M2Cl6.
Show the answer and explanation

Answer: C (MCl3)

Explanation

Mole ratio M : Cl = 20.22/27 : 79.78/35.5 = 0.75 : 2.25 = 1 : 3, so the empirical formula is MCl3.