Limiting Reagent Worksheet
1.
Calcium hydroxide, used to neutralize acid spills, reacts with hydrochloric acid according to the
following equation:
Ca(OH)2 + 2HCl  CaCl2 + 2H2O
(a)If you have spilled 6.3 mol of HCl and put 2.8 mol of Ca(OH) 2 on it, which substance is the limiting
reactant?
(b)How many moles of the excess reactant remain?
2.
Aluminum oxidizes according to the following equation: 4Al + 3O 2  2Al2O3
(a)Powdered Al (0.048 mol) is placed into a container containing 0.030 mol O 2. What is limiting reactant?
(b)How many moles of the excess reactant remain?
3.
Heating zinc sulfide in the presence of oxygen yields the following:
ZnS + O2  ZnO + SO2
(a)If 1.72 mol of ZnS is heated in the presence of 3.04 mol of O2, which is the limiting reactant?
(Balance the equation first)
(b)How many moles of the excess reactant remain?
4.
Chlorine can replace bromine in bromide compounds forming a chloride compound and elemental
bromine. The following equation is an example of the reaction:
2KBr(aq) + Cl2(aq)  2KCl(aq) + Br2(l)
(a)When 0.855g of Cl2 and 3.205g of KBr are mixed in solution, which is the limiting reactant?
(b)How many grams of each product are formed?
5.
A process by which zirconium metal can be produced from the mineral zirconium (IV) orthosilicate,
ZrSiO4, starts by reacting it with chlorine gas to form zirconium (IV) chloride.
ZrSiO4 + 2Cl2  ZrCl4 +SiO2 + O2
What mass of ZrCl4 can be produced if 862g of ZrSiO4 and 950.g of Cl2 are available? (You must first
determine limiting reactant).
6.
In the reaction BaCO3 + 2HNO3  Ba(NO3)2 + CO2 + H2O, what mass of Ba(NO3)2 can be formed
by combining 55g BaCO3 and 26g HNO3?
7.
Aspirin, C9H8O4, is synthesized by the reaction of salicylic acid, C7H6O3, with acetic anhydride,
C4H6O3.
2C7H6O3 + C4H6O3  2 C9H8O4 + H2O
a.
When 20.0 g of C7H6O3and 20.0g of C4H6O3 react, which is the limiting reagent?
b.
What mass in grams of aspirin are formed?
8. When lead (II) nitrate reacts with sodium iodide, sodium nitrate and lead (II) iodide are formed.
a)
Balance the following equation:
Pb(NO3)2 (aq) +
NaI (aq) 
PbI2 (s) +
NaNO3 (aq)
b)
If I start with 25.0 grams of lead (II) nitrate and 15.0 grams of sodium iodide, how many grams of
sodium nitrate can be formed?
c)
What is the limiting reagent in the reaction described in problem 2b?
d)
How many grams of lead(II) iodide is formed?
e)
How much of the nonlimiting reagent will be left over from the reaction in problem #2b?
f)
If 6 grams of sodium nit are formed in the reaction described in problem #2b, what is the percent yield
of this reaction?
9)
1000 grams of sodium chloride is combined with 2000 grams of barium phosphate.
a)
Balance the following equation:
6 NaCl
b).
+
Ba3(PO4)2

Na3PO4
+
BaCl2
What is the limiting reactant?
c)
How many grams of excess reactant are left?
10)
4000 grams of heptane is combusted with 7000 grams of oxygen.
C7H16
+
11 O2

7 CO2
+
a)
What is the limiting reactant?
b)
How many grams of carbon dioxide is produced?
8 H2O
c) How many grams of excess reactant are left?
11) Aluminum dissolves in an aqueous solution of NaOH according to the following reaction:
2 NaOH + 2 Al + 2 H2O -----> 2 NaAlO2 +
If 84.1 g of NaOH and 51.0 g of Al react:
a) Which is the limiting reagent?
b)
How much of the other reagent remains?
c) What mass of hydrogen is produced?
3 H2
12. Zinc and sulphur react to form zinc sulphide according to the equation.
Zn + S ---------> ZnS
If 25.0 g of zinc and 30.0 g of sulphur are mixed,
a) Which chemical is the limiting reactant?
b) How many grams of ZnS will be formed?
c) How many grams of the excess reactant will remain after the reaction is over?
13. 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?
c)
What is the limiting reagent for the reaction in #b? __________________
d)
How many grams of copper(II) nitrate is formed?
e)
How much of the excess reagent is left over in this reaction?
f)
If 11.3 grams of sodium chloride are formed in the reaction described in problem #2, what is the
percent yield of this reaction?