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Chemistry · Oct / Nov 2021 · Paper 12 · Question 12

5070The mole and the Avogadro constant

When gases react, the volume of gaseous reactants may be different from the volume of gaseous products. For which reaction is the percentage change in the volume of gas largest? (Assume each reaction goes to completion.)

  1. A2SO2(g) + O2(g) → 2SO3(g)
  2. BCH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
  3. CN2(g) + 3H2(g) → 2NH3(g)
  4. D2C2H6(g) + 7O2(g) → 6H2O(g) + 4CO2(g)

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Correct answer: C. N2(g) + 3H2(g) → 2NH3(g)

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