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Consider the following statements about choosing between the two ideal reactors.
1. A PFR is usually smaller for the same conversion.
2. A CSTR is easier to control thermally.
3. The choice never depends on the reaction order.

  • A.1 and 2 only
  • B.3 only
  • C.1 only
  • D.All of them

Answer: A

Correct answer: 1 and 2 only

Statements 1 and 2 are the standard trade: the PFR is usually smaller and the CSTR easier to control thermally. Statement 3 is wrong - the order matters greatly. At zero order the two volumes are identical, at first order the CSTR is somewhat larger, and at higher orders or high conversion the penalty grows sharply, while autocatalysis reverses the comparison altogether.

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