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JAMB Chemistry 2003 Question 19

Question 19

Mole Concept and Stoichiometry

When 10g of sodium hydroxide is dissolved in 1000cm3 of water, the solution formed is approximately [Na = 23, H = 1, O = 16]

  1. A.0.01 mol dm-3
  2. B.0.10 mol dm-3
  3. C.0.25 mol dm-3
  4. D.0.50 mol dm-3
Show the answer and explanation

Answer: C (0.25 mol dm-3)

Explanation

NaOH = 40 g/mol, so 10 g = 0.25 mol in about 1 dm3: 0.25 mol dm-3.