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An isothermal flash calculation determines

  • A.the pressure at which the last drop condenses
  • B.the number of stages needed for a separation
  • C.the vapour fraction and both phase compositions
  • D.the temperature at which a mixture starts to boil

Answer: C

The feed composition and the K values are given, and the Rachford-Rice equation is solved for the vapour fraction. The second and third options describe bubble and dew point calculations instead. Each answers a different question about the same mixture.

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