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Chemistry · May / June 2019 · Paper 12 · Question 13

5070The mole and the Avogadro constant

A sample of magnesium hydroxide, Mg(OH)2, is made by adding an excess of aqueous sodium hydroxide to an aqueous solution containing 1.20 g magnesium sulfate, MgSO4. The mass of magnesium hydroxide formed is 0.26 g. What is the percentage yield of magnesium hydroxide?

  1. A10.5%
  2. B21.7%
  3. C44.8%
  4. D61.9%

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Correct answer: C. 44.8%

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