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The accumulation term in a material balance is written as

  • A.the reaction rate multiplied by the volume
  • B.the total amount held inside the system
  • C.the time derivative of the amount inside
  • D.the difference between the two flow rates

Answer: C

It is a rate, so its units match those of the flow terms it is balanced against. Writing the inventory itself rather than its derivative is the commonest mistake in setting these problems up. A units check catches it at once.

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