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COMEDK2018ChemistrySome Basic Concepts of Chemistry

4 moles each of SO ₂ and O ₂ gases are allowed to react to form SO ₃ in a closed vessel. At equilibrium 25 % of O ₂ is used up. The total number of moles of all the gases present at equilibrium is

Options

  1. A6.5
  2. B7.0
  3. C8.0
  4. D2.0

Correct answer

B. 7.0

Step-by-step solution

aligned & array lccc & 2 SO ₂+ O ₂ & 2 SO ₃ Initially & 4 moles & 4 moles & 0 At equili. & (4-2) & (4-0.25 4) & 2 & =2 & =3 & array & Total moles at equilibrium =2+3+2=7 moles. aligned

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