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A tie component in a material balance is one that

  • A.reacts completely in the process
  • B.is added purely for the purpose of the calculation
  • C.passes through unchanged and appears in two streams
  • D.is present in the largest amount

Answer: C

Nitrogen in a combustion calculation is the standard example, and it lets streams be related without solving the full set of equations. Identifying one early often shortens a problem dramatically. Looking for one is worth doing before writing any equations.

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