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Stoichiometry: Limiting Reagents
Related Topics
Wize University Chemistry Textbook > Stoichiometry
Limiting Reagents
5 Activities
When we are solving a stoichiometry problem and are given a balanced reaction, the limiting reagent is the reagent that...
(There are 2 correct answers)
we have the fewest number of moles of
we have the greatest number of moles of
produces the least amount of product
produces the greatest amount of product
I don't know
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More Limiting Reagents Questions:
Stoichiometry and Limiting Reagent
Consider the following balanced equation:
2 NH
3
(g) + 3 CuO (s) → N
2
(g) + 3 Cu (s) + 3 H
2
O (l)
A reaction mixture contains 18.1 g NH
3
and 90.4 g CuO. How much of the limiting reagent in (g's) is remaining?
Chemical reactions: Limiting Reagent
Sodium metal reacts with water to give sodium hydroxide and hydrogen gas as per the following unbalanced equation:
N
a
(
s
)
+
H
2
O
(
l
)
→
N
a
O
H
(
a
q
)
+
H
2
(
g
)
Na(s)+H_2O(l)\rightarrow NaOH(aq)+H_2(g)
N
a
(
s
)
+
H
2
O
(
l
)
→
N
a
O
H
(
a
q
)
+
H
2
(
g
)
If 1.00 g of sodium were reacted with 0.786 g of water which species would be the limiting reagent?
Stoichiometry and Limiting Reagent
Consider the following balanced equation:
2 NH
3
(g) + 3 CuO (s) → N
2
(g) + 3 Cu (s) + 3 H
2
O (l)
A reaction mixture contains 18.1 g NH
3
and 90.4 g CuO. How much of the limiting reagent in (g's) is remaining?
Stoichiometry: Limiting Reagents
Vanillin acetate is a synthetic flavoring agent used to mimic the natural flavor of vanilla in candies, beverages, ice creams, and baked goods. You only need 10-30 ppm concentrations of vanillin acetate to flavor most foods! The preparation of this compound is described by the balanced reaction scheme below. Use the data provided to answer the following questions.
Chemical reactions: Limiting Reagent & Percent Yield
Iron oxidizes when exposed to oxygen to form iron oxide according to the following equation:
Fe (s) + O
2
(g) → Fe
2
O
3
(s)
352g of pure iron is exposed to 12.0 mols of O
2
, and after a period of time, 46.7 g of iron oxide (rust) is collected.
Sodium metal reacts with water to give sodium hydroxide and hydrogen gas as per the following unbalanced equation:
N
a
(
s
)
+
H
2
O
(
l
)
→
N
a
O
H
(
a
q
)
+
H
2
(
g
)
Na(s)+H_2O(l)\rightarrow NaOH(aq)+H_2(g)
N
a
(
s
)
+
H
2
O
(
l
)
→
N
a
O
H
(
a
q
)
+
H
2
(
g
)
If 1.00 g of sodium were reacted with 0.786 g of water which species would be the limiting reagent?
Gas Stoichiometry and Limiting Reagent
Consider the following equation:
4NH
3
(g) + 7O
2
(g) → 4NO
2
(g) + 6H
2
O(l)
3 L NH
3
and 7 L O
2
were reacted at 350
°
C and 111 kPa. How much NO
2
can be produced?
Stoichiometry: Yield
What is the maximum amount of iodine gas (in moles) that can be formed if 1.00 mole of manganese (IV) oxide was allowed to react with 2.00 moles of hydroiodic acid to from manganese(II) iodide, iodine gas, and water?
Chemical reactions: Limiting Reagent & Percent Yield
Iron oxidizes when exposed to oxygen to form iron oxide according to the following equation:
Fe (s) + O
2
(g) → Fe
2
O
3
(s)
352g of pure iron is exposed to 12.0 mols of O
2
, and after a period of time, 46.7 g of iron oxide (rust) is collected.
Stoichiometry: Limiting reagents
3.
Consider the chemical reaction described below:
C
a
3
(
P
O
4
)
2
(
s
)
+
C
(
s
)
+
S
i
O
2
(
s
)
→
C
a
S
i
O
3
(
s
)
+
C
O
(
g
)
+
P
(
l
)
Ca_3\left(PO_4\right)_2\ \left(s\right)\ \ \ \ +\ \ \ \ C\ \left(s\right)\ \ \ \ +\ \ \ \ SiO_2\ \left(s\right)\ \ \ \ \rightarrow\ \ \ \ CaSiO_3\ \left(s\right)\ \ \ \ +\ \ \ \ CO\ \left(g\right)\ \ \ \ +\ \ \ \ P\ \left(l\right)
C
a
3
(
P
O
4
)
2
(
s
)
+
C
(
s
)
+
S
i
O
2
(
s
)
→
C
a
S
i
O
3
(
s
)
+
C
O
(
g
)
+
P
(
l
)
a)
What is the limiting reagent for this reaction if an initial reaction mixture contains 1325 kg of calcium phosphate, 300 kg of carbon and 890 kg of silicon dioxide.
Chemical Reactions: Limiting Reagent & Percent Yield Practice
Iron oxidizes when exposed to oxygen to form iron oxide according to the following equation:
Fe + O2 →Fe2O3
352g of pure iron is exposed to 12.0 mols of O2, and after a period of time 46.7 g of iron oxide (rust) is collected.
Stoichiometry: Limiting reagents
Ammonia, NH
3
, and borane, BH
3
, react to form a Lewis adduct, ammonia borane as shown below.
N
H
3
(
s
o
l
)
+
B
H
3
(
s
o
l
)
→
N
H
3
B
H
3
(
s
)
NH_{3(sol)} + BH_{3(sol)} \rightarrow NH_3BH_{3(s)}
N
H
3
(
so
l
)
+
B
H
3
(
so
l
)
→
N
H
3
B
H
3
(
s
)
If 24 mL of a 0.74 M solution of ammonia is mixed with 12 mL of a 1.8 M solution of borane what is the maximum mass of ammonia borane that can be produced?
Stoichiometry: Limiting reagents
17g of P
4
reacts with 64g of oxygen, O
2
as described below in the UNBALANCED reaction. What is the maximum amount of P
4
O
6
that can be formed?
P
4
(
s
)
+
O
2
(
g
)
→
P
4
O
6
(
s
)
P_{4(s)}+O_{2(g)}\rightarrow P_4O_{6(s)}
P
4
(
s
)
+
O
2
(
g
)
→
P
4
O
6
(
s
)
Chemical Reaction: Limiting Reagent
If 12 g of sodium is mixed with 0.64 g of H
2
and 17 g of O
2
which reagent will be limiting in the reaction shown below?
2
N
a
(
s
)
+
O
2
(
g
)
+
H
2
(
g
)
→
2
N
a
O
H
2\ Na_{(s)}+O_{2(g)}+H_{2(g)}\rightarrow 2\ NaOH
2
N
a
(
s
)
+
O
2
(
g
)
+
H
2
(
g
)
→
2
N
a
O
H
Chemical Reactions: Limiting Reagents
Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:
4
N
H
3
+
5
O
2
→
4
N
O
+
6
H
2
O
\rm 4NH_3+5O_2\rightarrow4NO+6H_2O
4N
H
3
+
5
O
2
→
4NO
+
6
H
2
O
When 20.0 g
N
H
3
\rm NH_3
N
H
3
and 50.0 g
O
2
\rm O_2
O
2
are allowed to react, which is the limiting reagent?
Chemical Reactions: Limiting Reagents
Magnesium metal reacts with
HCl
\text{HCl}
HCl
to produce magnesium chloride (
MgCl
2
\text{MgCl}_ 2
MgCl
2
) and hydrogen gas (
H
2
\text{H}_2
H
2
). If 0.568 g of magnesium are reacted with 75.0 mL of a 0.450 M solution of
HCl
\text{HCl}
HCl
, how much magnesium metal will remain after the reaction is complete?
Chemical Reactions: Limiting Reagent & Percent Yield Practice
Iron oxidizes when exposed to oxygen to form iron oxide according to the following equation:
Fe + O
2
→Fe
2
O
3
352g of pure iron is exposed to 12.0 mols of O
2
, and after a period of time 46.7 g of iron oxide (rust) is collected.
Chemical Reactions: Limiting Reagents
Consider the following unbalanced reaction
Which reagent is in excess?
Chemical reactions: Limiting Reagent
Sodium metal reacts with water to give sodium hydroxide and hydrogen gas as per the following unbalanced equation:
N
a
(
s
)
+
H
2
O
(
l
)
→
N
a
O
H
(
a
q
)
+
H
2
(
g
)
Na(s)+H_2O(l)\rightarrow NaOH(aq)+H_2(g)
N
a
(
s
)
+
H
2
O
(
l
)
→
N
a
O
H
(
a
q
)
+
H
2
(
g
)
If 1.00 g of sodium were reacted with 0.786 g of water which species would be the limiting reagent?