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JAMB Chemistry 1981 Question 39

Question 39

Mole Concept and Stoichiometry

What mass of sodium carbonate is in 500 cm3 of 0.1 molar sodium carbonate solution? (Na = 23, C = 12, O = 16)

  1. A.10.6 g
  2. B.5.3 g
  3. C.500 g
  4. D.10 g
  5. E.20 g
Show the answer and explanation

Answer: B (5.3 g)

Explanation

Moles = 0.5 dm3 × 0.1 mol dm−3 = 0.05 mol; mass = 0.05 × 106 = 5.3 g.