Limiting Reactant
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Transcript Limiting Reactant
Limiting Reactant
A.K.A. Stoichiometry
How do we determine which
reactant limits the product?
One reactant remains while the other is
consumed in a reaction
Mole ratio will help determine the
limiting reaction
Need to create a conversion pathway
How Do Hot Fudge Sundaes and
Limiting Reactants Relate?
How Many Sundaes Can You Make?
Two!
The chocolate syrup limits the recipe!
Which reactant is the limiting
reactant?
Which reactant remains when 6.70 mole
Na reacts with 3.2o moles of Cl2
2 Na + Cl22 NaCl
Step 1
Moles of
reactant
Moles of
product
2 Na + Cl22 NaCl
Step 1
Step 1
Moles of Na
Mole Ratio
Moles of NaCl
6.70 moles of Na
2 mol NaCl
= 6.70 mol NaCl
2 mol Na
Moles of Cl2
Mole Ratio
Moles of Product
3.20 moles of Cl2
2 mol NaCl
= 6.40 mol NaCl
1 mol Cl2
Cl2 is the Limiting Reactant!
It’s Your Turn…
Limiting Reactant Worksheet
Limiting Reactant and Mass-Mass
Conversions
Which reactant is the limiting reactant
when 3.5 g Cu reacts with 6.0 g AgNO3?
Cu + AgNO3 Cu(NO3)2 + Ag;
balanced?
Cu + 2 AgNO3 Cu(NO3)2 + 2 Ag
Create a Conversion Pathway
Cu + 2 AgNO3
Cu(NO3)2 + 2 Ag
We have 3.5 g Cu and 6.0 g AgNO3
Step 1
Mass of
Reactant
Step 2
Moles of
Reactant
Step 3
Moles of
Product
Mass of
Product
Cu + 2 AgNO3
Cu(NO3)2 + 2 Ag
Mass of Cu
Molar Mass
of Cu
Mole Ratio
Molar Mass
of Ag
Mass of Ag
3.5 g Cu
1 mol Cu
2 mol Ag
108 g Ag
= 12 g Ag
63.5 g Cu
1 mol Cu
1 mol Ag
Mass of
AgNO3
Molar Mass
of AgNO3
Mole Ratio
Molar Mass
of Ag
Mass of Ag
6.0 g AgNO3
1 mol AgNO3
2 mol Ag
108 g Ag
= 3.8 g Ag
169.9 g
AgNO3
2 mol AgNO3
1 mol Ag
Silver nitrate is the limiting reactant!
Homework
Read pp. 257-258
Answer problems pg. 263: 45