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JAMB Chemistry 1982 Question 20

Question 20

Mole Concept and Stoichiometry

The number of grammes of potassium hydroxide in 250 cm3 of one molar solution is (K = 39, O = 16, H = 1)

  1. A.40 g
  2. B.52 g
  3. C.100 g
  4. D.26 g
  5. E.14 g
Show the answer and explanation

Answer: E (14 g)

Explanation

Moles = 0.25 × 1 = 0.25 mol; KOH = 56 g/mol, so mass = 0.25 × 56 = 14 g.