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All of the following are assumptions of the ideal CSTR EXCEPT

  • A.steady state operation
  • B.uniform temperature throughout
  • C.a concentration gradient along it
  • D.perfect mixing throughout the vessel

Answer: C

Correct answer: a concentration gradient along it

A gradient is precisely what an ideal CSTR does not have; perfect mixing means the composition is uniform and equal to the exit stream. Steady state, uniform temperature and perfect mixing are the three assumptions that define the ideal. A gradient along the length is the defining feature of the plug flow reactor instead.

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