The document discusses limiting and excess reactants in stoichiometric calculations. A limiting reactant is the reactant that is used up first in a chemical reaction and limits the amount of products that can be formed. Any reactant in excess not used up in the reaction is called the excess reactant. Sample problems are provided to demonstrate how to identify the limiting and excess reactants and use stoichiometric calculations to determine the maximum amount of products and leftover excess reactant.

1. LIMITING AND EXCESS
REACTANT

2. Limiting and Excess
Reagent

3. Stoichiometric Calculations
In such cases, the reactant which is allowed to
be used up in a reaction is called a limiting
reagent, so called because it limits the
maximum amount of products that can be
formed.
On the other hand, a reactant used in excess in
a reaction is called excess reagent.

4. Stoichiometric Calculations

5. Stoichiometric Calculations

6. Stoichiometric Calculations

7. Stoichiometric Calculations

8. Stoichiometric Calculations

9. Identifying the Limiting and Excess
Reagents

10. Sample Problem 1

11. Sample Problem 2

12. Board work:
1) When copper (II) chloride reacts with sodium
nitrate, copper (II) nitrate and sodium chloride are
formed.
a) Write the balanced equation for the reaction
given above:
CuCl2 + NaNO3  Cu(NO3)2 + NaCl
b) If 15 grams of copper (II) chloride react with 20
grams of sodium nitrate, how much sodium chloride
can be formed?

13. Board work:
c) What is the limiting reagent for the reaction in #2?
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d) How many grams of copper(II) nitrate is formed?
e) How much of the excess reagent is left over in
this reaction?