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Chemistry · Oct / Nov 2025 · Paper 12 · Question 10

5070The mole and the Avogadro constant

A chemist prepares calcium nitrate. They start with 8.00 g of pure calcium oxide and an excess of dilute nitric acid. They produce 12.65 g of pure, dry anhydrous calcium nitrate crystals. What is the percentage yield of calcium nitrate? [relative atomic masses, Ar: Ca, 40; N, 14; H, 1; O, 16]

  1. A54.0
  2. B63.2
  3. C67.1
  4. D86.8

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Correct answer: A. 54.0

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