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Iterative solution of a cubic equation of state for the vapour root is usually started from

  • A.the parameter b itself
  • B.half of the liquid volume
  • C.the ideal gas volume
  • D.the critical volume of the fluid

Answer: C

The vapour root lies close to the ideal value at moderate pressure, so the iteration converges in a few steps. Starting from b, which is near the liquid volume, is the standard way to converge on the liquid root instead.

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