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JAMB Chemistry 2007 Question 50

Question 50

Mole Concept and Stoichiometry

What weight of NaCl is needed to make 2.0 dm3 of a 1.5M solution? [Na = 23, Cl = 35.5]

  1. A.116 g
  2. B.175 g
  3. C.87 g
  4. D.58 g.
Show the answer and explanation

Answer: B (175 g)

Explanation

Moles = 1.5 × 2.0 = 3.0 mol. Mass = 3.0 × 58.5 = 175.5 g ≈ 175 g.