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JAMB Chemistry 2000 Question 5

Question 5

Mole Concept and Stoichiometry

How many moles of HCl will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?

  1. A.14
  2. B.12
  3. C.11
  4. D.10
Show the answer and explanation

Answer: A (14)

Explanation

K2Cr2O7 + 14HCl → 2KCl + 2CrCl3 + 7H2O + 3Cl2, so 14 moles of HCl give 3 moles of chlorine.