A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of...

JAMB 1999

A gaseous metallic chloride MClx consists of 20.22% of M by mass. The formula of the chloride is
[M = 27, Cl = 35.5]
  • A. MCl
  • B. MCl2
  • C. MCl3
  • D. M2Cl6
Correct Answer: Option C
Explanation
Percentage by mass of M = 20.22%
Percentage by mass of Cl = ?
100 - 20.22 = 79.78%
Mass given ration of M
M = 2022/27 = 0.75
Chlorine = 79.78/35.5 = 2.24
Divide by the smallest
M = 0.75/0.75 = 1
Cl = 2.24/0.75 = 3
∴ The formula = MCl3

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