Stoichiometry Limiting Reagents. Stoichiometry If the quantity of each reactant is given, you must...
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Transcript of Stoichiometry Limiting Reagents. Stoichiometry If the quantity of each reactant is given, you must...
Stoichiometry
Limiting Reagents
Stoichiometry
If the quantity of each reactant is given, you must determine which one is used up first. This is the Limiting Reagent
The other reactant is not completely consumed in the reaction. It is in Excess.
Stoichiometry
Like many problems in chemistry, there are multiple ways of solving these problems.
You can save yourself some work, by first identifying what you need to solve for and then choosing the appropriate method.
Don’t worry if you choose the wrong method, you’ll get to the correct answer, it will just take you a few more steps.
Stoichiometry
Types of problems:1. You want to know how much of the
excess reactant remains.2. You want to know how much product
is formed
Stoichiometry
CaCl2 (aq) + 2 AgNO3 (aq) Ca(NO3)2 (aq) + 2 AgCl(s)
65.35g 112.08g
Determine which is the LR and how much of the excess reagent remains1. Begin with either reactant; convert to moles; use your mole ratio to get to the other reactant; convert back to grams
Stoichiometry
CaCl2 (aq) + 2 AgNO3 (aq) Ca(NO3)2 (aq) + 2 AgCl(s)
65.35g 112.08g
Stoichiometry
CaCl2 (aq) + 2 AgNO3 (aq) Ca(NO3)2 (aq) + 2 AgCl(s)
65.35g 112.08g
How much product can be formed?1. Begin with either reactant; convert to moles; use the mole ratio to get to your product; convert back to grams2. This must be done for each reactant3. The reactant that produces the least amount of product is the LR
Stoichiometry
CaCl2 (aq) + 2 AgNO3 (aq) Ca(NO3)2 (aq) + 2 AgCl(s)
65.35g 112.08g