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The well-mixed assumption means that

  • A.the flow rates in and out are equal
  • B.the outlet composition equals that inside
  • C.the vessel is at a quite uniform temperature
  • D.no reaction occurs at all in the vessel

Answer: B

It is what allows the outlet stream to be written in terms of the single unknown inventory, which is what makes the differential equation solvable. Without it the vessel would need a spatial description as well as a temporal one.

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