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Limiting Reactant. Which will run out first?. Each reactant’s amount will be provided, either in moles or mass Two methods can be used Trial Method Advancement Method. Trial Method.

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which will run out first
Which will run out first?
  • Each reactant’s amount will be provided, either in moles or mass
  • Two methods can be used
  • Trial Method
  • Advancement Method
trial method
Trial Method
  • Use mass-mass stoichiometry calculation to determine how much Reactant B will be required to completely consume Reactant A.
  • Sample Problem: 15.0g of N2 reacts with 15.0g of H2 to make ammonia according to the equation N2 + 3H2 → 2NH3
  • How much ammonia can be made?
solution to ex 1
Solution to Ex. 1
  • Trial method calculation
  • Advancement Method
  • Moles of each reactant (n)/coefficient then compare results
  • N2: 15.0g/28.02g/mol/1mol = 0.535
  • H2: 15.0g/2.016g/mol/3mol = 2.48
  • Lowest value is ALWAYS LR
and the point is
And the point is…
  • Since it runs out first, the limiting reactant must be determined in order to determine the maximum theoretical yield for this reaction.
  • How much ammonia (NH3) can be made from these amounts of reactants?
  • Trial method calculation