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JAMB Chemistry 1994 Question 22

Question 22

Mole Concept and Stoichiometry

20 cm3 of a 2.0 M solution of ethanoic acid was added to excess of 0.05 M sodium hydroxide. The mass of the salt produced is [Na = 23, C = 12, O = 16, H = 1]

  1. A.2.50 g
  2. B.2.73 g
  3. C.3.28 g
  4. D.4.54 g
Show the answer and explanation

Answer: C (3.28 g)

Explanation

Moles of acid = 0.020 × 2.0 = 0.04 mol, giving 0.04 mol of CH3COONa (M = 82). Mass = 0.04 × 82 = 3.28 g.