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Discussion

When a reaction occurs, the balance on a molecular species must include

  • A.generation and consumption terms
  • B.an accumulation term and nothing more
  • C.a work term in addition to the rest
  • D.no additional terms of any kind at all

Answer: A

A species may be created or destroyed by the reaction, so input and output no longer match. The total mass balance still holds without such terms, because mass itself is conserved. Only the molecular species balances gain the extra terms.

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