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Two CSTRs of unequal size are to be used in series for a first order reaction. The best arrangement is

  • A.quite impossible to determine
  • B.either order, the result being the same
  • C.the smaller one going first in every case
  • D.the larger one first in every case

Answer: B

For first order kinetics the product of the two factors is unchanged by their order. For other orders the sequence does matter, and the optimum depends on which way the rate curve bends. First order is the one order that is indifferent.

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