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Empirical Formulae
Related Topics
Wize University Chemistry Textbook > Stoichiometry
Introduction to Chemical Equations and Balancing
6 Activities
An organic compound, C
5
H
12
O
2
, is combusted in air to produce carbon dioxide and water vapour. Balance the chemical reaction that occurs.
C
5
H
12
O
2
(
l
)
+
10
O
2
(
g
)
→
5
C
O
2
(
g
)
+
12
H
2
O
(
g
)
C_5H_{12}O_2\ \left(l\right)\ \ \ \ +\ \ \ \ 10O_2\ \left(g\right)\ \ \ \ \ \rightarrow\ \ \ \ 5CO_2\ \left(g\right)\ \ \ \ +\ \ \ \ 12H_2O\ \left(g\right)
C
5
H
12
O
2
(
l
)
+
10
O
2
(
g
)
→
5
C
O
2
(
g
)
+
12
H
2
O
(
g
)
C
5
H
12
O
2
(
l
)
+
7
O
2
(
g
)
→
5
C
O
2
(
g
)
+
6
H
2
O
(
g
)
C_5H_{12}O_2\ \left(l\right)\ \ \ \ +\ \ \ \ 7O_2\ \left(g\right)\ \ \ \ \ \rightarrow\ \ \ \ 5CO_2\ \left(g\right)\ \ \ \ +\ \ \ \ 6H_2O\ \left(g\right)
C
5
H
12
O
2
(
l
)
+
7
O
2
(
g
)
→
5
C
O
2
(
g
)
+
6
H
2
O
(
g
)
C
5
H
12
O
2
(
l
)
+
8
O
2
(
g
)
→
5
C
O
2
(
g
)
+
6
H
2
O
(
g
)
C_5H_{12}O_2\ \left(l\right)\ \ \ \ +\ \ \ \ 8O_2\ \left(g\right)\ \ \ \ \ \rightarrow\ \ \ \ 5CO_2\ \left(g\right)\ \ \ \ +\ \ \ \ 6H_2O\ \left(g\right)
C
5
H
12
O
2
(
l
)
+
8
O
2
(
g
)
→
5
C
O
2
(
g
)
+
6
H
2
O
(
g
)
2
C
3
H
8
O
2
(
l
)
+
14
O
2
(
g
)
→
10
C
O
2
(
g
)
+
12
H
2
O
(
g
)
2C_3H_8O_2\ \left(l\right)\ \ \ \ +\ \ \ \ 14O_2\ \left(g\right)\ \ \ \ \ \rightarrow\ \ \ \ 10CO_2\ \left(g\right)\ \ \ \ +\ \ \ \ 12H_2O\ \left(g\right)
2
C
3
H
8
O
2
(
l
)
+
14
O
2
(
g
)
→
10
C
O
2
(
g
)
+
12
H
2
O
(
g
)
I don't know
Check Submission
More Introduction to Chemical Equations and Balancing Questions:
Chemical reactions: Combustion
Select the correct balanced equation for the complete combustion reaction expected to occur between C
4
H
10
and O
2
.
Balancing equations and naming compounds
Balance these chemical reactions and answer the following questions. Write a 1 in the blank if the coefficient is 1.
1
KF (aq) +
1
HI (aq) →
1
KI (aq) +
1
HF (aq)
The full name of the acid that is produced in this reaction is
hydrofluoric acid
Writing Molecular and Net Ionic Equations
Write the
balanced
net ionic equations (NIE) and molecular equations (ME) for the following. Show all your work. Be sure to show the
states
in the final equations as well as the
charges
on any ions.
A. NaCl (aq) + Pb(NO
3
)
2
(aq) →
ME:
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 Reactions: Limiting Reagents
Consider the following unbalanced reaction
Which reagent is in excess?
Balancing Redox Equation
What is the coefficient of KI when the unbalanced expression below is balanced using the smallest whole number coefficients?
K
2
S
2
O
3
+ I
2
→
K
2
S
4
O
6
+ KI
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?
Which one of the following is not a correct formation equation?
Consider the following unbalanced equation:
Zn (s) + NO
3
−
(aq) + H
+
(aq) → Zn
2+
(aq) + NH
4
+
(aq) + H
2
O (l)
Write the net ionic and complete molecular reaction
Net Ionic and Complete Molecular Equation
Consider the following unbalanced reaction:
KMnO
4
(aq) + FeSO
4
(aq) + H
2
SO
4
(aq) → Fe
2
(SO
4
)
3
(aq) + MnSO
4
(aq) + K
2
SO
4
(aq) + H
2
O (l)
Write the balanced net ionic and complete molecular equation
Combustion
Select the correct balanced equation for the complete combustion reaction expected to occur between C
3
H
7
OH and O
2
.
A. C
3
H
7
OH + O
2
→
3 CO
2
+ 4 H
2
O
B. 2 C
3
H
7
OH + 9 CO
2
→
6 CO
2
+ 8 H
2
O + 9 C
Empirical Formulae
4.
An organic compound, C
3
H
8
O
2
, is combusted in air to produce carbon dioxide and water vapour. Balance the chemical reaction that occurs.
Chemical Reactions: Balancing Combustion Reactions
Balance the reaction below. Make sure that the reaction has the lowest possible stoichiometric coefficients.
C
12
H
14
O
+
O
2
→
C
O
2
+
H
2
O
C_{12}H_{14}O\ \ \ \ +\ \ \ \ O_2\ \ \ \ \rightarrow\ \ \ \ CO_2\ \ \ \ +\ \ \ \ H_2O
C
12
H
14
O
+
O
2
→
C
O
2
+
H
2
O
Chemical Reactions: Balancing the Combustion of Pyridine
Choose the answer that balances the reaction shown below:
A
C
4
H
4
O
(
l
)
+
B
O
2
(
g
)
→
C
C
O
2
(
g
)
+
D
H
2
O
(
g
)
\text{A}\ C_4H_4O(l)+\text{B}\ O_2(g)\rightarrow\text{C}\ CO_2(g)+\text{D}\ H_2O(g)
A
C
4
H
4
O
(
l
)
+
B
O
2
(
g
)
→
C
C
O
2
(
g
)
+
D
H
2
O
(
g
)
Chemical Reactions: Balancing
Balance the following reaction:
C
5
H
10
O
(
l
)
+
O
2
(
g
)
→
CO
2
(
g
)
+
H
2
O
(
l
)
\text{C}_5H_{10}\text{O}_{\left(l\right)}+\text{O}_{2\left(g\right)}\rightarrow\ \text{CO}_{2\left(g\right)}+\text{H}_2\text{O}_{\left(l\right)}
C
5
H
10
O
(
l
)
+
O
2
(
g
)
→
CO
2
(
g
)
+
H
2
O
(
l
)
What coefficient is in front of oxygen gas in the balanced reaction?