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JAMB Chemistry 1982 Question 14

Question 14

Mole Concept and Stoichiometry

What weight of sodium hydroxide is required to make 500 cm3 of 0.2 M solution? (Na = 23, O = 16, H = 1)

  1. A.40 g
  2. B.20 g
  3. C.10 g
  4. D.4 g
  5. E.2 g
Show the answer and explanation

Answer: D (4 g)

Explanation

Moles = 0.5 × 0.2 = 0.1 mol; mass = 0.1 × 40 = 4 g.