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At steady state with no reaction, the material balance reduces to

  • A.input equals output for every species present
  • B.the input equals the output for the total flow only
  • C.the accumulation is equal to the generation
  • D.the input is equal to the accumulation term

Answer: A

Correct answer: input equals output for every species present

With no reaction nothing is created or destroyed, and at steady state nothing accumulates, so the general balance collapses to input equals output - and it does so for each species separately, not merely for the total. That per-species form is what supplies the several independent equations a flowsheet problem needs.

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