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An atomic species balance is attractive because

  • A.it avoids any need for a basis of calculation
  • B.it applies only to combustion problems as such
  • C.atoms are conserved, so no reaction terms appear
  • D.it requires rather fewer streams to be labelled

Answer: C

Correct answer: atoms are conserved, so no reaction terms appear

An atomic balance is written as input equals output for each element, with no generation or consumption term and no need for the reaction extents. It is therefore the shorter route when several reactions occur at once or when the stoichiometry is not fully known - a combustion problem with an unspecified fuel composition being the classic case.

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