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Chemistry · May / June 2025 · Paper 12 · Question 10

5070The mole and the Avogadro constant

100 cm³ of ethene is completely combusted in 400 cm³ of oxygen. The volumes of both gases are measured at r.t.p. What is the final volume of gas in the mixture measured at r.t.p.?

  1. A200 cm³
  2. B250 cm³
  3. C300 cm³
  4. D500 cm³

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Correct answer: C. 300 cm³

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