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Block:
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Honors Chemistry: Practice Calculations Honors Chemistry Final Eram
l.
r tt: . tS J/mr /
In manmals. lactose (milk sugar) is metabolized to glucose (C6Hr206). the key nutrient
for generating chenlical potential energy. Calculate the percent composition ofeach atonl
in glucose.
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;:-;;<,(
iZ ,lZ g
...........-...cC -
IcO j
3q qq%c
2.
{t.
co,
lsL r3)
EuY,I
5,.L\,7, A
Write balanced chemical eqlrations based on the following
descriptions/equations/reprcsentations shoun belo\\':
Cu(s)
S(s))-LCurs(s)
a. lL
b.
Solid tetraphosphorus decoxide reacted
phospho c acid.
I
c.
+ I
fr0,, o,
,
i{0(o
U
Boron oxide + Sodium hydroxide
)
I9r0r .' 6 f{&oH --. 2
a. tl cH,N + I
o:
)
*ith liquid water to lbrnr aqueous
--, L Hf|tc,t)
Sodium ror?/e (BOJJJ + \,vater
NaitsDr
!L co: +
!l
'3[lrO
H:o +
-LN.
3. lBizO:+3C>2Bi +3CO
Whcn 283 g of Bi:O: r'eacts with excess carbon. how nany:
a.
rnoles ofcarbon monoxide are present?
Ls\1
b.
)rl JB'.c,
!,r!,, 3,,*,,
,*t 90.t?l
B,zct, .lLY.I
l"
B,
l.8Z hii
CO
mg of Bi are formed?
L\1t
rur Bzcr. Z *tB. .,,i,i(.,8,
B,zC,,
- 1L;/i1)B.rCr'
' ,*, '
1.nt B.rbr
&
2,rI, t{ *\
B,
t;,n
l1
-1. A steel unk has a \olune ol-+i8 L and is tilled \ith 0.885 kg olox)gen gas. Calculare
the pressure ofthe oxygen at 21 degrees Celsius.
PV'nRT*'
or
" "
c. 1r'- r.,
i^
:!:+
t,r.
-
t tut
Lj' . ll. t
]2 c(J('z
s. 2 Ictr* 3 Hro>-LICI+ I
a.
8.-!3J
v
rnrr
- (zt.l,-)Xe.xzr**X
C,
z.rq
r)
HIoi + J--HCI
If635 g ofiodinc trichloride reacts with I 18.5 g ofrvater. identify the limiting
reagent.
t3tq ECl,
1L 4L' tltt
l"'r t(-ll-, f rwr 0r'l -;;:17:
" 7.,v tsrkt1 z,*, t(-t'
,,t f
.
"
.1
b.
tl1f
1
Hzo
1##,. i:#, ,##
L4xltttt
. 311 t,
fCL ,: r^t
rt(t
How many gmn1s ofexcess reagent remain alier the reaction corupletes?
t(t'
.
*##
. 1) t'
ffi,,- i:#'
tt\'{ t"
H{>
-13
--\.1.1.1
1lL1
<-! GJs
6
A weather balloon is filled with helium to a volume of 1.61L a|734 torr' What is the
volume ofthe balloon after it has been released and its pressure has droppcd to 0.844
atnl? Assume the iempcrature remains constanl
(,v, (v.
€'@'
7.
V. -_ f,V,
L
-
ri9 t ,., t
(o.rr,r,
"i^o
1L. h\ t
J-Xt.
orc)
(o.v.fi ..1")
( -:-- -l
7,.
4 ,,166
J'.
lr51 L,
oflhe most widespread environmental carcinogens is benzo[a]pyrene (nlolar mass=
252.30 g/mol). lt is found in coal dust. cigarette smoke. aDd even charcoal-grilled meal.
,{nalysis ofthe hydrocarbon shows a ntass percenl ol95.2l C aDd 4 79 H. what is the
One
molccular fonnula of benzoIa]pyrene?
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q.vi,
iJ.
t.,r1n"
t'Y',tl - \.tq,,.t tl
litril
H;
- l,r,l
r'*9' '' u' t )Liarfltq't
t/t'tl
- uI
Lf z.\.
cz .a91lnu
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-\
AH"j4-!,
'
8.
.
Potassium nitrate decornposes on heating to form potassium oxide and both nitrogen and
-,+A
oxvcen oases.
a.
fNC, _3--1 L,g16
How nlany rnoles ol'potassium nitrate will produce 56.6 g ofoxygen gas?
5b.lo1L, , t @t(), ,
'
)2.&.ttz
b.
* Z N.,5_O,
''l
nr',
kre';
gtut(.
,
i,'lZ
r'"2
I
kM;
What \\ould be the total volume ol lhe gaseous products combined ifthis reaclion
uas lun a(STPIJ rZ.,.lL . l,r,,l
55.
q L .r'5
gn,luil:
),l.L.L
9.
-;;;.'
' r: $ L Nr
A common chlorofluorocarbon used in refrigerants was CCllF. Calculate the percenl
chlorine by mass lbr this compound.
lD0 )t-i
t
10.
rzvL^'
r^"rtCc t4qt NLz qLD! -;;n:'
L-,
x
tOO ,
1+,301
rr,qz'l
ct
A sample ofcarbon monoxide occupies 3.65L at 300K and 745 ton. Find its volume at
367 ton and -1.1 degtecs Celsius.
-LS'1
K
f'v'
ti'+'il11+"'!*) . ,.r'l
---., f,\',T,. flv:.,
r,
-fl . i-v'
r*
Z'
(t,,+{",rxl&E)
)
?'.,.''lz
,1 -' -flii
'L
6l
"-'/
follo\\iDg inlo balanced equations:
When galliuur nretal is heated in oxygen gas. it melts and forms solid galliuDl
oxidc.
.\
11. CoDvert the
a.
5c,.,(r)' 3 O.<l)S z
b.
Liquid hcxane (CcHr)
vapor.
br.rms
b^La.b)
in ox!gen gas to form carbon dioxide and water
z- tL t *l,trlj
t1..* ,tt L'l,r)
t,
--l z (C2,,) , t\
-IL
I
>O,,,t
(lll)
Y
\
c.
remains.
C.Clr("r) *-a
3
12.
solid
When solutions ofcalcium chloride and sodium phosphate are mixed.
calcium phosphate forms and sodium chloride soiution
)
fu-drrD.1(,l) -; L(or!ci,\\4, + 6 Nn( /r:r
\J
A blimp is filled with 3950 kg of helium at 73 I mmHg at 20 degrees Celsius. w hat is the
volume ofthe blimp under thesc conditions?
c1.gg.1656ro) ll€
,^;*.
1tle, i.,i.
I t)
''1.cc y)t
('iY$"/cr,*")&(vufr+{z?ra
?v.nFi- -, v. nAJ
(
J'tsr
O
,'tbl 41,,/,
=D.,*-,L.TI
L2-:-------=
following pressures as described below to atm:
At the peak of Mount Everest, atnlospheric pressure is only 2.75x102 mmHg.
13. Convert the
a.
-I;..b;i^
'-r!v-,
1Li"'at1)
b.
A cyclist fills her bike tires to 86 psi.
8t" rs;
c.
> t,1,1Pi
,:"!.',.. ,l@
L
The surface ofVenus has an atmospheric pressure of9.15x101 kPa.
,t,rs,,;"9,.
d.
A1 100ft
below sea level. a scuba diver experiences a pressure of2.54x104 torr.
2,5'1,tb'*.tr
14.
+lh- .li;r il,
.
rt
, -!-.!:!2- ' --3:!!-,lar.4
1Lt 'r'ht\ t
I lirr
A lab reacts 158 g ofalurninum sulfidc \\,ith l3I
a. Identify rhe limiring rcasent.
_-]-
t5t1 Alzs,
l)t, ltg
b.
'
g
,
lt,L
^.,
tTTztrrt
>
"
' LtLll!+L
1 ,*' ttv,'
4i,S. , 6 H,a
)q t1
1
't lJ,>
""r
/
-----
3
-
11
t
I
i
rruis
, L
cv ., l],s
Alzs)
,lZtljllLs
v5
;
:##
'4lttLc
ffi; +frw,'
l9l
llq
I
i1a5
Identily the amount ol exqess reactant Ieli over.
rsrl hlea,
\
ofwaler.
3't c't,,45
, tltt *,tt 4\L,, -141tl-i
--T;;I,
)'atz>, , h,.,lE "
^
"./,.
Alblt)t
'nRT
1'f
- 1'v -dI
ofair. noble gases are placed over highly reaclive chemicals 10
act as an inert 'blanketing" gas. A chemical engineer places a mixture ofnoble gases
consisting of 5.5 0g helium. I 5.0g of DeoD. and 3 5.0g of krypton in a piston-cylirder
15. To prevent the presence
(2.00L) assembly at 273K. Calculate the partial pressure ofeach gas. Then- what would
the gas ofthe ertire gas mixture be?
5 sc r, llt
"
t:Y-!, - t . \\ .*r
,t.t\^.rtte
llc
)r.(:.)L+,
(1,.
-
L!u.n!:2j*LtYzor)
2
ccr-
;fiE.D,1ts
d,_r
.
o,yt) ftt
l;L
Lr
ot'lt'b.,,1t*,\,:-L.!*4j)t?Lo
----'-.,,oL
?*.tu*ebixo4
I-frtil;..J^
't .t
|
li. 5 eir'.r
l,ctt.ttt,
16.
$.a,)Ni > !y+
(@':l;}ol;i)
\
A sample of Freon-12 (C[2Cl:) occupies 25.5L at 298K and 153.3 kPa. Find its volume
r,
at STP.
f,
t.rl) Jh
TL- Z1)L
P2. lnfr"
?1v,T.
= f,v, r
V, 7z
Vz= 'af,
Pr7,
w##;t
S
tlr,t