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The a parameter of a cubic equation of state reduces the pressure because

  • A.the gas constant is somewhat smaller for a real gas
  • B.attraction between molecules pulls them from the wall
  • C.the molecules occupy space that is then not available
  • D.the temperature is effectively lowered by the attraction

Answer: B

A molecule about to strike the wall is pulled back by its neighbours, so it arrives with less momentum than an ideal calculation predicts. The term is subtracted from the pressure and scales with the square of density.

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