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The limiting reactant in a reaction is the one that

  • A.is in the smallest stoichiometric proportion
  • B.is present in the smallest mass of all
  • C.has the largest molar mass of any of them
  • D.reacts most quickly of all the reactants

Answer: A

Correct answer: is in the smallest stoichiometric proportion

The limiting reactant is identified by dividing each reactant’s available moles by its stoichiometric coefficient and taking the smallest result - not by comparing raw amounts, and certainly not by mass. A reactant present in the largest quantity can still be limiting if the equation demands proportionally more of it.

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