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CHE 100
Worksheet # 9
Due __________
1.)
Name _________________________________
Isooctane (C8H18) is the principle component of gasoline.
Isooctane burns in the engine according to the following reaction;
2 C8H18 + 25 O2  16 CO2 + 18 H2O
a.)
How many moles of H2O are produced when 4.50 moles
of C8H18 burns.
4.50 moles C8H18 x 18 moles H2O
2 moles C8H18
b.)
=
7.680 moles CO2
How many moles of oxygen are needed to react with
8.50 moles of C8H18?
8.50 moles C8H18 x 25 moles O2 =
2 moles C8H18
2.)
40.5 moles H2O
How many moles of CO2 are produced when 12.00 moles
of O2 reacts?
12.00 moles O2 x 16 moles CO2
25 moles O2
c.)
=
106 moles O2
How many moles of Mg are needed to react exactly with 6.00 moles of HNO3
according to the following equation:
Mg +
2HNO3 
6.00 moles HNO3 x 1 mole Mg =
2 moles HNO3
Mg(NO3)2 + H2
3.00 moles Mg
3.)
In the following reaction, how many grams of NO2 are produced if 5.00 g of N2H4
react?
Molar Masses
N2H4
+
3 O2  2NO2
+
2H2O
N2H4 32.06 g/mole
NO2 46.01 g/mole
5.00 g N2H4 x 1 mole N2H4 x 2 mole NO2 x 46.01 g NO2 =
32.06 g N2H4
1 mole N2H4
1 mole NO2
4.)
How many moles of oxygen are produced when 175.85 g of KClO4 (molar
mass 138.55 g/mole) decomposes?
KClO4(s) 
KCl(s) + 2O2(g)
175.85 g KClO4 x 1 mole KClO4 x 2 mole O2 =
138.55 g KClO4 1 mole KClO4
5.)
14.4.g NO2
2.5384 mole O2
In the reaction
4HPO3
+
12C  2H2 + 12CO + P4
how many molecules of H2 are produced when 3.50 moles of C react?
3.50 moles C x 2 moles H2 x 6.022 x 1023 molecules H2 =
12 moles C
1 mole H2
6.)
3.51 x 1023 molecules H2
How many grams of H2O2 are needed to produce 3.73 g of H2O using the reaction
N2H4 + 2H2O2

N2
+ 4H2O
Molar Masses
H2O 18.02 g/mole
H2O2 34.02 g/mole
3.73 g H2O x 1 mole H2O x 2 mole H2O2
18.02 g H2O
4 mole H2O
x 34.02 g H2O2 =
1 mole H2O2
3.52 g H2O2
7.)
Copper metal reacts with silver nitrate, AgNO3, to produce copper (II)
nitrate, Cu(NO3)2, and silver metal.
a.)
Write a balanced equation for this reaction.
Cu(s) + 2 AgNO3(aq)  Cu(NO3)(aq) + 2 Ag(s)
b.)
How many moles of silver are produced when 18.625 moles of copper
react?
18.625 moles Cu x 2 moles Ag
1 moles Cu
8.)
=
37.250 moles Ag
Emergency oxygen masks contain potassium superoxide, KO2 pellets. When
exhaled CO2 passes through the KO2, the reaction below occurs:
The oxygen produced can then be inhaled so no air from outside the mask is
needed.
KO2(s) +
a.)
K2CO3(s) +
O2(g)
(unbalanced)
Balance the equation.
4 KO2(s) +
b.)
CO2(g) 
2 CO2(g) 
2 K2CO3(s) +
3 O2(g)
If the mask contains 125 g of KO2 how many grams of oxygen can be
produced?
125 g KO2 x 1 mole KO2 x 3 mole O2 x 32.00 g O2 =
71.10 g KO2
4 mole KO2
1 mole O2
42.2 g O2
Balancing Chemical Equations
Rewrite and balance the equations below and label each as- Synthesis,
Decomposition, Single Replacement, Double Replacement or Combustion

1.)
N2 + 3 H2
2 NH3
2.)
2 KClO3
3.)
2 NaCl + F2  2 NaF + Cl2
Single Replacement
4.)
2 H2 + O2  2 H2O
Synthesis
5.)
2 AgNO3 + MgCl2  2 AgCl + Mg(NO3)2
Double Replacement
6.)
2 AlBr3 + 3 K2SO4  6 KBr + Al2(SO4)3
Double Replacement
7.)
CH4 + 2 O2  CO2 + 2 H2O
Combustion
8.)
C3H8 + 5 O2  3 CO2 + 4 H2O
Combustion
9.)
2 C8H18 + 25 O2  16 CO2 + 18 H2O
10.)
FeCl3 + 3 NaOH
11.)
4 P + 5 O2  2 P2O5
Synthesis or Combustion
12.)
2 Na + 2 H2O  2 NaOH + H2
Single Replacement or Synthesis
13.)
2 Ag2O
14.)
S8 + 12 O2  8 SO3
15.)
6 CO2 + 6 H2O  6 O2 + C6H12O6
16.)
2 K + MgBr2  2 KBr + Mg
17.)
2 HCl + CaCO3  CO2 + H2O + CaCl2 Double Replacement and
Decomposition
 2 KCl + 3 O2
Synthesis
Decomposition
Combustion
 3 NaCl + Fe(OH)3
 4 Ag + O2
Double Replacement
Decomposition
Synthesis or Combustion
Synthesis
Single Replacement