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Discussion

A basis of one hour of operation is most useful when

  • A.compositions are given in mass per cent
  • B.the reaction stoichiometry is unknown
  • C.the problem is stated in flow rates
  • D.the process is a batch operation

Answer: C

Multiplying each flow rate by one hour turns a continuous problem into a fixed set of quantities. A batch problem already provides its own quantities and needs no such conversion. The choice of one hour is arbitrary and any interval will do.

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