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JAMB Chemistry 2005 Question 26

Question 26

Mole Concept and Stoichiometry

How many moles of limestone will be required to produce 5.6g of CaO? [Ca=40, C=12, O=16]

  1. A.0.20 mol
  2. B.0.10 mol
  3. C.1.12 mol
  4. D.0.56 mol
Show the answer and explanation

Answer: B (0.10 mol)

Explanation

CaCO3 → CaO + CO2 (1 : 1). Moles of CaO = 5.6/56 = 0.10 mol, so 0.10 mol of limestone is needed.