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State whether the following is true or false.
A flash calculation has a valid two-phase solution for any feed condition.

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

Answer: A

If the feed is below its bubble point it is all liquid and if above its dew point it is all vapour, and in either case the vapour fraction falls outside the range from zero to one. Checking the bracket first avoids a meaningless answer.

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