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JAMB Chemistry 2003 Question 17

Question 17

Mole Concept and Stoichiometry

What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm-3 solution? [K2CrO4 = 194.2g mol-1]

  1. A.0.97 g
  2. B.9.70 g
  3. C.19.42 g
  4. D.97.10 g
Show the answer and explanation

Answer: A (0.97 g)

Explanation

Moles = 0.020 × 0.250 = 0.005 mol. Mass = 0.005 × 194.2 = 0.971 g.