What is the balanced
equation for the
decomposition of hydrogen
peroxide into water and
oxygen gas?
2H2O2  2H2O + O2
What does the abbreviation
STP stand for?
Standard
Temperature &
Pressure
One mole of a compound
contains how many
particles?
6.02x1023 particles
One mole of carbon has a
mass of how many grams?
12 grams
6.02x1023 is also known as
Avagodro’s Number
The sum of the masses of the
elements composing a
compound is known as its
Formula Mass
One mole of any gas has
what molar volume?
22.4 Liters
The mass of each element in
a compound divided by the
formula mass is the
Percent composition
What is the percent
composition of CO2?
%C = 12/44 = 27%
%O = 16(2)/44 = 73%
Write the balanced formula
for the reaction of iron with
oxygen gas to form iron (III)
oxide.
4Fe + 3O2  2Fe2O3
If 4.3g of iron reacts with
oxygen, as in the previous
formula, what mass of Fe2O3
would be produced?
6.1 g Fe2O3
4.3g Fe 1mol Fe
56g Fe
2mol Fe2O3 160g Fe2O3
4mol Fe
1mol Fe2O3
How many liters of oxygen
are required for the previous
reaction?
1.29 L O2
4.3g Fe 1mol Fe
56g Fe
3mol O2
22.4 L O2
4mol Fe
1mol O2
Aluminum reacts with
bromine gas to produce
aluminum bromide. What is
the balanced equation for
this reaction?
2Al + 3Br2  2AlBr3
What type of reaction is the
one previously written?
2Al + 3Br2  2AlBr3
Synthesis reaction
If 15.0g Al reacts with 46.0g
Br2, which is the limiting
reactant?
46.0g Br2
15.0g Al
46.0g Br2
1mol Al
2mol AlBr3
267g AlBr3
27g Al
2mol Al
1mol AlBr3
1mol Br2
2mol AlBr3
267g AlBr3
160g Br2
3mol Br2
1mol AlBr3
= 148.3g
= 51.2g
Find the empirical formula for
the compound that consists of
20.23% Al and 79.77% Cl.
AlCl3
20.23g Al
1mol Al
27g Al
79.77g Cl
1mol Cl
35g Cl
= .75 mol Al
.75
= 2.28 mol Cl
=1
=3
.75
If the molar mass of the
compound in the previous
question is 264g, what is the
molecular formula?
Al2Cl6
AlCl3 formula mass = 132
264/132 = 2
For the formula 2P + 3Br2  2PBr3, if
5.0g P and 35g of Br2 react, what is
the limiting reactant and how what
mass of PBr3 is produced?
35g Br2 produces 39.5g PBr3
5.0g P
35g Br2
1mol P
2mol PBr3
271g PBr3
31g P
2mol P
1mol PBr3
1mol Br2 2mol PBr3
271g PBr3
160g Br2 3mol Br2
1mol PBr3
= 43.7g
= 39.5g
If the actual yield of PBr3
from the previous problem is
30g, what is the percent
yield?
75.9%
30g/39.5g
In the writing of an ionic
compound, how do we
determine the number of
each atom in the compound?
Criss cross the ionic
charges
What law are we following
when we balance a chemical
equation?
Law of Conservation
of Mass
Balance the following
equation:
Ca(ClO3)2  CaCl2 + O2
Ca(ClO3)2  CaCl2 + 3O2
What is the formula for:
iron (III) carbonate?
Fe2(CO3)3
Write the balanced equation for
the following word equation:
Aluminum chloride + Calcium  Aluminum + Calcium chloride
2AlCl3 + 3Ca  2Al + 3CaCl2