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KEY
Nitme
Dirte
Cl.rss
THE ARITHMETIC OF EQUATIONS
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Section Review
Objectives
. (lalculate the amount of reactants required
.
or product formed in a nonchemical
l)rocess
Interpret balanced chemical equations in terms of interacting moles,
representative particles, masses, and gas volume at STP
Vocabulary
.
stoichiometry
Part A Completion
Use this completion exercise to check your understanding of the concepts and terms
that are introduced in this section. Each blank can be completed with a term, short
phrase,or number
otivefqrh
vd
'Ihe coefficients of a balanced chemical equation indicate
b
v
the relative number
of reactants and products. AII
stoichiometric calculations begin with
ancl 4
-E'
<t,
I
of
2
a
.
Only
3
are conserved in every reaction; moles, volumes,
des
z. brrJthnnra*l e?us *iqrt
3. lnss$ _
4.
atorh
I
!.:E
q,
and representative particles may not be.
5.
g,
In solving stoichiometric problems, conversion factors
C'
L
q,
retating moles of reactants
to
5
of products are used.
6.
srP-stqnd-.d
t*f
* Prettvfe
cjt
If you
o
q
(l,
cl-
assume 6
, the balanced
fi.ration
also tells you
about the volumes of gases.
q
a,
Part B True-False
'ct
Classify each of these statements as always true, AT: sometimes true, ST; or neuer true,
NT
o
lg
o
or.
@
ffi
7.
tf
B. The
The coefficients in a balanced chemical equation can be used to form
mole ratios relating reactants to products.
coefficients in a balanced chemical equation tell the relative
volumes of reactants and products, expressed in any suitable unit of
vorume.
)
ftT
/
ONLV tF 6hs
To calculate the mass of a molecule in grams, you can use the molar
mass and Avogadro's number.
Chopter 12 Stoichiometry
2Ag
NA}I\E
l)atc,
:
jLtn.
e lass
llecarrse the rnass of the reactants etluals the rnass of the products of ir
will tle conservetl.
ruxrction, the nrrmber of rnoles
ftt ,,
5f
Part
tz. One rnole of any
gas occupies a volume
of 22,4 L.
C Matching
,Vlatch each clescription in Column B to the correct term
Column A
b
[3.
in Calumn
Column
stoichiometry
A.
B
il. rkogadro's number
_d_ L4. product
e
)
If the ratio of rnolecules in the reaction 2A, F l], --- ZLzll is 2: l:2, we carr
llretlict that 4 molecules nf A. react with 2 rnolecules 13, to produce 4
rnolecules of A,B.
b. the calculations of quantities in chemical reactions
15. coetticient
c. STP
d. a substance formed in
a
chemical reaction
€. gives the relative number of molecules involved
in
a
reaction
T#*
uO gas how many moleculer of
Nz gar would you
If you have 6
11.
rio,rta*'Ciuolt{offipsas,howmanymolesofN2 gaswouldyoumake?.
,,, rrlji,f
U
$g$loqof
tiiJlid
rfrmF;i.rrr"
I ff Ol&,lg
- . I mdg
make?
18.
LL3 Wl
(propytene), how mary moler of crrlsl\ woutd you make?
l:, If you have 0.038 moles of NO Brsr how manlr moles of C*IN would you
LL,
How many moles of chlorine gas will be required to react with sufficient iron to
produce 14 moles of iron(lll) chloride?
2Fe(s) + 3Cl2G, -* ZFeCl3$)
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