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In the van der Waals equation the parameter b accounts for

  • A.the finite volume occupied by the molecules
  • B.the attraction between the molecules acting at a distance
  • C.the kinetic energy carried by the moving molecules
  • D.the departure of the gas constant from its ideal value

Answer: A

Subtracting b from the molar volume reduces the space available for movement, which is the excluded volume correction. The parameter a is the one that carries the attractive contribution. Together they turn the ideal law into a two-parameter one.

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