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PRACTICE EXERCISES
on

STOICHIOMETRY

1
CHEMICAL FORMULAS
and
COMPOSITION STOICHIOMETRY

By

Temple C
...
The Mole and Molar Mass
...
Calculate the molar mass of each of the following compounds:
(a)
(b)
(c)
(d)
(e)

2
...

(b) number of iron atoms present
...
Calculate the:

3
...

(b)number of hydrogen atoms present
...
Calculate the:

4
...
Calculate the average mass in grams of:
(a)one Oxygen atom
...


B
...

6
...
Rank the following ores of Copper in increasing order of percent
composition of Copper; Azurite,
, Chalcocite,
,
Chalcopyrite,
, Malachite,
, and Cuprite,

...
Determination of Empirical and Molecular Formulas
...
Analysis of a pure chemical compound shows that it contains
Copper,
Sulphur, and
Oxygen
...
A sample of a compound is found to contain
of Nitrogen,
Chlorine, and
of Hydrogen
...
Combustion of
of a hydrocarbon produces
of

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11
...
The compound is known to contain only Carbon,
Hydrogen, and Oxygen
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12
...
If
mole of the
, determine the molecular formula of the drug
...
Chemical Composition and Purity of Samples
...
A pure sample of Calcium trioxosulphate (IV),
Calculate the mass of:
(a) Calcium present in the sample
...


14
...


would contain

15
...
A sample of Copper (II) oxide,
sample would contain:
(a)
of Copper
...


is only

pure
...
A sample of Iron (II) sulphide,
is contaminated to the extent of
(a)What mass of Iron is contained in
of the sample?
(b)What mass of the sample would contain
of Iron?


...
The Laws of Chemical Combination
...
In an experiment,
of a sample of an oxide of a metal, on reduction,
gave
of the metal
...
Show that this information is in
agreement with the law of definite proportions
...
Show that the compounds: water,
obey the law of multiple proportions
...
In two separate experiments,
a metal
to give compounds
and

and hydrogen peroxide,

,

and
of Chlorine combined with
respectively
...
Which law of
chemical combination is illustrated by this information?

MOVE TO THE NEXT PAGE FOR DETAILED ANSWERS
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ANSWERS WITH HINTS
1
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(a)

(b)

3
...
(a)
(b)

(Two atoms of Nitrogen make one molecule of Nitrogen)

5
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(a)

(b)

7
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8
...

10
...
)

11
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mole of it
...


(a)

(The molar mass of a substance is the mass of one

(b)

14
...

16
...
)

, then by

(b)
(Obtain
as the mass equivalent to
simple proportion find the mass equivalent to

...
(A sample contaminated to the extent of
is only
pure)
(a)
(Obtain
as the mass of
in the sample, then find
the mass of iron contained in this
of
)
(b)
(Obtain
as the mass equivalent to
, then by
simple proportion, find the mass equivalent to
)
18
...

19
...

20
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(The masses of Chlorine which
combined with a fixed mass of
are equal, i
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STOICHIOMETRY 2: CHEMICAL EQUATIONS AND REACTION
STOICHIOMETRY by Temple C
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