A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical…

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Chemistry JAMB 2002

A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]

  • KClO4
  • KClO
  • KClO2
  • KClO3 checkmark

The correct answer is: D

Explanation

K- (31.91%), Mole = 31.91/39 =0.8182
Cl-(28.93%), Mole = 28.93/35.5 = 0.815
O-(39.16%), Mole = 39.6/16 = 2.448
K = 0.8182/0.815 = 1
Cl = 0.815/0.815 = 1
O = 2.448/0.815 = 3
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