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Reaction mass efficiency differs from atom economy in taking account of

  • A.the energy consumed by the reaction
  • B.the toxicity of the reagents chosen
  • C.the actual yield and the excess reagents used
  • D.the solvent recovered for reuse

Answer: C

Correct answer: the actual yield and the excess reagents used

Atom economy is a theoretical figure from the balanced equation, assuming stoichiometric quantities and complete conversion. Reaction mass efficiency uses what was actually charged and actually obtained, so it falls below the atom economy whenever the yield is less than complete or a reagent is used in excess.

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