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Assertion (A): The well-mixed assumption is what makes a stirred tank problem tractable.
Reason (R): It lets the outlet concentration be replaced by the concentration inside the tank.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the mechanism: one variable then describes the whole vessel, and the balance becomes an ordinary differential equation instead of a partial one in space and time. Good agitation is what justifies the assumption.

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