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State whether the following is true or false.
The van der Waals equation predicts the critical compressibility factor accurately for most real fluids.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: A

It gives the same value for every substance while real fluids lie considerably lower and vary among themselves. That failure is the reason the later cubic equations were developed. Its value for water is under a quarter.

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