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JAMB Chemistry 1986 Question 5

Question 5

Mole Concept and Stoichiometry

How much of magnesium is required to react with 250 cm3 of 0.5 M HCl? [Mg = 24]

  1. A.0.3 g
  2. B.1.5 g
  3. C.2.4 g
  4. D.3.0 g
Show the answer and explanation

Answer: B (1.5 g)

Explanation

Moles of HCl = 0.25 × 0.5 = 0.125 mol. Mg + 2HCl → MgCl2 + H2, so Mg = 0.0625 mol × 24 = 1.5 g.