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Degrees of freedom for a process unit are computed as

  • A.the unknowns plus the equations
  • B.the streams less the species count
  • C.the equations less the unknowns
  • D.unknowns less independent equations

Answer: D

A result of zero means the problem is exactly specified, a positive value means more data are needed and a negative one signals an over-specification or an inconsistency. Doing this count first prevents a good deal of wasted algebra.

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