Stoichiometry Problems 1
1.
When lead (II) sulfide is burned in air, lead (II) oxide and sulfur dioxide are
produced. If 0.890
moles of sulfur dioxide were
produced, how many moles of oxygen gas were required to react with
the lead (II) sulfide?
___ PbS + ___ O2
à ___ PbO
+ ___ SO2
2. In
the synthesis reaction of aluminum and oxygen to produce aluminum oxide, how
many grams of
aluminum are required to react with
0.223 moles of oxygen?
___ Al + ___ O2 à
___ Al2O3
3.
Calculate the number of grams of oxygen produced if 2.50 grams of potassium
chlorate are
decomposed completely by
heating.
___ KClO3 à ___ KCl + ___ O2
4.
How many moles of oxygen are needed for the complete combustion of 3.0 moles of
methane
(CH4)?
___ CH4 + ___ O2
à ___ CO2 + ___ H2O
5.
Using the same equation from #4, how many grams of carbon dioxide are formed
when 8.0 grams
of methane react? ___ CH4 +
___ O2 à ___ CO2
+ ___ H2O
6.
When elemental sulfur combines with oxygen gas, sulfur dioxide is formed.
What is the total
number of grams of oxygen needed to
react completely with 2.0 moles of sulfur?
___ S + ___ O2 à
___ SO2
7. In
the synthesis of water from its elements, what is the total number of grams of
oxygen gas
needed to produce 54 grams of water? ___ H2
+ ___ O2 à ___ H2O
8.
How many moles of aluminum oxide will be formed when 27 grams of aluminum react
completely
with excess oxygen
gas? ___ Al
+ ___ O2 à ___ Al2O3
9. What
mass (in grams) of sodium oxide is produced by the reaction of 1.44 grams of
sodium with
excess oxygen?
10. What
mass (in grams) of water will be given off when 1.92 x 1022 molecules
of octane (C8H18) are
burned
11. How many grams of Al2(SO4)3
are need to react with KCl in order to produce 1.245 moles
of
__ Al2(SO4)3 +
__ KCl à __ AlCl3 + __
K2SO4
12.
Hydrogen gas can be produced through the following unbalanced reaction.
__ Mg + __ HCl
à __ MgCl2
+ __ H2
a. What mass of HCl is consumed by the reaction of 2.50 moles of magnesium?
b. What mass of each product is
produced in part a.?
13.
Acetylene gas, C2H2, used in welding, produces an
extremely hot flame when it burns in pure
oxygen according to the following
unbalanced reaction.
__ C2H2 + __ O2 à
__ CO2 + __ H2O
How many molecules of CO2 are
produced when 2.50 x 104 grams of C2H2 burn
completely?
1.) 1.34 moles O2 2.)
8.02 g Al 3.) 0.980 g O2 4.)
6.0 moles O2 5.) 22 g CO2
6.) 64 g O2 7.)
48 g O2 8.) 0.50 moles Al2O3 9.)
1.94 g Na2O
10.) 5.16 g H2O 11.)
142.1 g Al2(SO4)3 12.) a) 183 g HCl b) 238 g MgCl2; 5.00 g H2
13.) 1.16 x 1027 mcs CO2