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An overall balance around the entire plant is often written because it

  • A.replaces the need for any unit balances
  • B.always has zero degrees of freedom left
  • C.involves only fresh feed and final products
  • D.is the only balance guaranteed to be correct

Answer: C

Internal streams including recycles cancel out, so the overall balance is usually the simplest one available. It is normally written first and the unit balances then fill in the internal detail. Every recycle cancels within the plant envelope.

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