++++Chem 161-2008 Chapter 3A-Stoichiometry Practiceproblems
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ATOMS" IONS" MOLES AND MOLECULAR TS
C& 161-2007 E' IH#%%" P&t+*))# &t '%." 4t&(#t#o$C't&+ 3A Sto#)#o&t+: C)'% C'%)*%'t#o$!Ato!" #o$!" o%&! '$( o%&)*%'+ ,t!22. Ho, '$ !o(#* 'to! '+& t&+& #$ 6.05 o/ N'3NA. 3.6 1024'to!
B. 1.3 1023'to!C. 0.22 'to!D. 4.6 1022'to!
E. 0.072 'to!
N'3N65
3 22.8809 14.01 ;
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> C& 161-2006 E' IH#%%" P&t+*))# &t '%." 4t&(#t#o$C't&+ 3 Sto#)#o&t+: C)'% C'%)*%'t#o$!Ato!" #o$!" o%&! '$( o%&)*%'+ ,t!
Ho, '$ o5&$ 'to! '+& t&+& #$ 2.2> o%&! o/ B'SO4A. 8.00B. 2.41 ? 1024
C. >.42 ? 1024
D. 1.3> ? 1024
E. 3.38 ? 1023
2.2> o% 6.022 1023 o%&)*%&!=o%9 4 o5&$ 'to!=o%&)*%&9 ; >.42 1024'to! O.
C
7 C& 161-200> E' I@*('% 6t&(#t#o$C't&+ 3AAto!" #o$!" o%&! '$( o%&)*%'+ ,t!'t #! t& N '!!9 #$ 'o$#* $#t+'t&
A. 17.>B. 21.2
C. >3..0
NH4NO3; 14.01 4 1.00.00
3
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3 C& 161-200> #$'% &'C't&+ 3 - Sto#)#o&t+Mo%&! '$( o%&)*%'+ ,t!A 0.0>67 5 !'%& o/ ' )oo*$( )o$t'#$! >. 1018o%&)*%&!. 't #! t& o%'+ '!!o/ t#! )oo*$(
A. 126mol
g
C. 32mol
g
E. >67 5>. 1018o%&)*%&!M
P%'$: o%&)*%&! o%&! M>. 1018o%&)*%&! 1 o%=6.022 1023o%&)*%&!99 ; 8.738 10->o%&!0.0>67 5=8.738 10->o%&!9 ; >
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27 C& 161-200> #$'% &'C't&+ 3 - Sto#)#o&t+Mo%&! '$( o%&)*%'+ ,t!#) o$& o/ t& /o%%o,#$5 #! t+*& +&5'+(#$5 t& '!! o/ o$& o%&)*%& o/ H2O
Mass(amu) Mass(g)
A. 1< 1 1.1 10-23
D. 1< 3.0 10-23
E. 3.0 10-23 10 C& 161-200> #$'% &'C't&+ 3 - Sto#)#o&t+Mo%&! '$( o%&)*%'+ ,t!'t '!! o/ !o(#* !*%/'t& ,#%% )o$t'#$ >.00 1022o5&$ 'to!
A. 12.> 5
B. 16.2 5C. 5
N'2SO41 o% N'2SO4; 4 o% O
P%'$: 'to!O o%&!O o%&!N'2SO4 5N'2SO4
>.00 1022O 'to! 1 o% O=6.022 1023O 'to!9 1 o% N'2SO4=4 o% O 'to9 142.0> 5=o% ; 2.8>5 N'2SO4
12 C& 161-200> E' I@*('% 6t&(#t#o$C't&+ 3AAto!" #o$!" o%&! '$( o%&)*%'+ ,t!Ho, '$ !*%/*+ 'to! '+& t&+& #$ 0.>665 o/ N'2S2O3
A. 1.20 1024'to!
B. 2.16 1021'to!
C. 4.31 1021'to!D. 0.00716 'to!E. 2 'to!
M N'2S2O3; 2 22.889 2 32.069 3 16.009 ; 1>66 5 1 o%=1>
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21 C& 161-200> E' I@*('% 6t&(#t#o$C't&+ 3Ato!" #o$!" o%&! '$( o%&)*%'+ ,t!
T& &!t#'t&( o*%'t#o$ o/ t& %'$&t #! )*++&$t% 'o*t 6.> 108&o%&. Ho, '$ o%&! o/
&o%& #! t'tA. 3.8 1033o%
B. 6.> o%
C. 1.1 10-14o%D. 1.1 o%E. 3.8 o%
6.> 108&o%& 1 o%&=6.022 1023&o%&9 ; 1.0< 10-14o%
22 C& 161-200> E' I@*('% 6t&(#t#o$C't&+ 3Ato!" #o$!" o%&! '$( o%&)*%'+ ,t!
A 0.0>675 !'%& o/ ' )oo*$( #! /o*$( to )o$t'#$ 8.74 10->o%!. 't #! t& o%'+ '!! o/
t& )oo*$(
A. 1.72 10-35=o%
B. >.>2 5=o%C. >>2 5=o%
D. >675=8.74 10->o%9 ; >.6 o% '& ' '!! o/ 12.8 5
A. C2H4O
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B. CO2C. C2H6D. CH2C%2E. CH3C%
P%'$: o% 5 MA. C2H4O 44.0>B. CO2 44.01C. C2H6 30.07D. CH2C%2 0.4E. 1
&$0.311 58.03 1020o%&)*%&!
& G$o, t& 'to#) ,t o/ & '$( /+o t& &+#o(#) t'%&. I/ ,& /o*$( t& Mo/ &$" t&$ ,& )o*%( (&t&+#$& t& '%*& o/ $.P%'$: o%&)*%&! o%&! M8.03 1020o%&)*%&! 1 o%=6.022 1023o%&)*%&!9 ; 0.001488> o%
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0.311 5=0.001488> o% ; 207.40 5=o% ; M& ; 131.30 5=o%207.40 - 131.30 ; 76.1 5=o% ; '!! o/ 76.1=18.00 ; 4.01 o% o/ T&+&/o+&" &$; &4
24. C& 161-2004 E' I@*('% 6t&(#t#o$C't&+ 3Mo%&! '$( Mo%'+ M'!!&!%*o+#$& '! o$% o$& !t'%& #!oto& -18 o/ +&%'t#& 'to#) '!! 18.0. T& '!! o/ '
/%*o+#$& 'to #!
A. 3.16 10-235B. 18.0 5C. 6.02 10-235D. 3
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21 C& 161-2004 E' I@*('% 6t&(#t#o$C't&+ 3AAto!" #o$!" o%&! '$( o%&)*%'+ ,t!
T& &!t#'t&( o*%'t#o$ o/ t& %'$&t #! )*++&$t% 'o*t 6.> 108&o%&. Ho, '$ o%&! o/
&o%& #! t'tA. 3.8 1033o%
B. 6.> o%
C. 1.1 10-14o%D. 1.1 o%E. 3.8 o%
6.> 108&o%& 1 o%&=6.022 1023&o%&9 ; 1.0< 10-14o%
22 C& 161-2004 E' I@*('% 6t&(#t#o$C't&+ 3AAto!" #o$!" o%&! '$( o%&)*%'+ ,t!
A 0.0>675 !'%& o/ ' )oo*$( #! /o*$( to )o$t'#$ 8.74 10->o%!. 't #! t& o%'+ '!! o/
t& )oo*$(
A. 1.72 10-35=o%
B. >.>2 5=o%C. >>2 5=o%
D. >675=8.74 10->o%9 ; >.2 5B. 3.62 5C. 14.> 5D. 28.0 5
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E. 1.THEDITIONCHEM 161-2002 RECITATION 3RDEECHAPTER 3 - STOICHIOMETRY
12
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ATOMS" IONS" MOLES AND MOLECULAR EIJHTS
3-28C'%)*%'t& t& '!! o/ >00. 'to! o/ #+o$ &9.
& ; >>. 5=o%6.022 1023 'to!=o%
>00 'to 1 o%=6.022 10239 'to99 >>. 5=o% ; 4.64 10 -205 &
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@UMDAHL >THEDITIONCHEM 161-2002 RECITATION 3RDEECHAPTER 3 - STOICHIOMETRYATOMS" IONS" MOLES AND MOLECULAR EIJHTS
3-3>
C'%)*%'t& t& o%'+ '!! o/ t& /o%%o,#$5 !*!t'$)&!.'. NH3
N ; 14.01H ; 1.013 H ; 3 1.0114.01 3 1.0199 ; 17.04
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@UMDAHL >THEDITIONCHEM 161-2002 RECITATION 3RDEECHAPTER 3 - STOICHIOMETRYATOMS" IONS" MOLES AND MOLECULAR EIJHTS
3-37 o(.
Ho, '$ o%&!" o%&)*%&! '$( 'to! '+& +&!&$t #$ 1.00 5 o/ NH3
17.04 5=o%1 5 1o%=17.04 59 ; 0.0>3 1022o%&)*%&!
4 'to!=o%&)*%&3.>3 1022o%&)*%&! 4 'to!=o%&)*%& ; 14.14 1022'to!
1>
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CHEM 161-2001 SUMMER-EAM I ANSERS
@UMDAHL CHAPTER 3 - STOICHIOMETRY
ATOMS" IONS" MOLES AND MOLECULAR EIJHTS13. Ho, '$ o5&$ 'to! '+& t&+& #$ 3.00 5 o/ !o(#* (#)+o't&" N'2C+2O7A. 0.0
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B. 0.036 5.C. 0.0 %05.
D. 0.016 5.E. 0.04< 5.
14
CHEM 161-2000 EAM I
@UMDAHL CHAPTER 3 - STOICHIOMETRY
ATOMS" MOLES AND MOLAR MASSES MOLECULAR EIJHTS9Ho, '$ o5&$ 'to! '+& )o$t'#$&( #$ 2.74 5 o/ A%2SO493
A. 12B. 6.02 1023
C. 7.22 1024
D. >.78 1022
E.
CHEM 161-2000 EAM I
@UMDAHL CHAPTER 3 - STOICHIOMETRY
ATOMS" MOLES AND MOLAR MASSES MOLECULAR EIJHTS9
T& &+)&$t o5&$ '!! #$ o+'" N'2B4O710 H2O" #!
A. 42
B. 71C. 17D. 40E. 28
CHEM 161-2000 INAL EAM ANSERSCHAPTER 3 - STOICHIOMETRYATOMS" IONS" MOLES AND MOLECULAR EIJHTS26. T& '!! &+)&$t o/ H2O #$ t& (+'t& N'2SO4QH2O #! 47.0 . 't #! #! t& $*&+ o/ o%&! o/ ,'t&+ /o+ &') o%& o/ N'2S049
A. 3 B. 4 C. > D. 6
E. 7
17
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N'2SO4Q H2O>35 475
>3=141.8< ; 0.3733 o%&! N'2SO4
47=1
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CHEM 161-2001-HOURLY EAM I ANSERS
@UMDAHL CHAPTER 3 - STOICHIOMETRY
ATOMS" IONS" MOLES AND MOLECULAR EIJHTS
12. T& '!! o/ 0.00227 o% o/ t& )oo*$( O3#! 0.236 5. T& 'to#) ,t o/&%&&$t #!:
A. 31.0 B. 68.0 C. 177 D. 46.8 E. >8.0St+'t&5:#$( M O3.S*t+')t A o/ O '$( /+o t& M to 5&t A o/
0.236 5 o/ O3=0.00227 o% O3; 103.86 5 O3=o% O3; MO3103.86 - 16 3 1899 ; 30.86
CHEM 161-2001-HOURLY EAM I ANSERS
@UMDAHL CHAPTER 3 - STOICHIOMETRY
ATOMS" IONS" MOLES AND MOLECULAR EIJHTS1>. C+o#* &%&&$t 249 '$( o5&$ /o+ t& o%'to#) #o$" C+2O7
2-. T& tot'% $*&+ o/ &%&)t+o$! #$ t#! o%'to#) #o$ #!:
A. 16 B. 2
C. >< D. 106 E. 162
T& 'to#) $*&+ ; t& $*&+ o/ +oto$!T& $*&+ o/ +oto$! ; t& $*&+ o/ &%&)t+o$!" '(*!t&( to )'+5&" #/ '$.C+ 'to#) $*&+ ; 24O 'to#) $*&+ ; %024 5D. #! 2.> J5E. #! 6.02 %0235
6.022 10225+'&!=o% o/ 5+'&!9 4.1 5=5+'&9 ; 2.47 10245=o% o/ 5+'&!
CHEM 161- 2002 INAL EAM ANSERSCHAPTER 3 - STOICHIOMETRYATOMS" IONS" MOLES AND MOLECULAR EIJHTS10 E. Coo!& t#! )o#)& #/ $o$& o/ t& ot&+! #! )o++&)t
St+'t&5: Co$&+t 5 o/ 5o%( to o%&! o/ 5o%( to 'to! o/ 5o%( t&$ )'%)*%'t& )o!t &+ 'to.
386 5 A*=187 5o%-19 6.022 1023'too%-19 ; 12.107 1023'to! ; 1.21 1024'to!
601=1.21 1024'to ; 487 10-24='to ; 4.87 10-22='to
18.CHEM 161- 2002 EAM I ANSERS
CHAPTER 3 - STOICHIOMETRYATOMS" IONS" MOLES AND MOLECULAR EIJHTS#) o$& o/ t& /o%%o,#$5 !t't&&$t! #! t+*&
A. I/ o$& #$5 o$5 '%% '! ' '!! o/ >.0 5" o$& o%& o/ #$5 o$5 '%%! '! ' '!! o/ 3.0 1022 5
>.0 5='%% 6.023 1023'%%!=o%&9 ; 3.01 1024'%%!=o%&
B. T& '!! o/ o$& o%& o/ 14C#! '+o#'t&% 14 '*
T& '!! o/ o$& 'to o/ 14C #! '+o#'t&%14 '*
C. A o$& o%& !'%& o/ 14C (o&! $ot '& ' '!! o/ &')t% 14 5.T#! #! t+*&. O$& o%& o/ 12C ,'! '+#t+'+#% '!!#5$&( to '& ' '!! o/ &')t% 12 5. T& (#//&+&$)&&t,&&$ 12C '$( 14C #! t,o $&*t+o$!. O$& o%& o/ $&*t+o$! ,! ' %#tt%& o+& t'$ 1 5. H&$)&" t&'!! o/ 14C #! ' %#tt%& o&+ 14 5.
D. I/ 6.0 1023#$5 o$5 '%%! '& ' '!! o/ 3.0 10245" t&$ o$& #$5 o$5 '%% '! ' '!! o/ >
'*
I/ 6.0 1023#$5 o$5 '%%! '& ' '!! o/ 3.0 10245" t&$ o$& #$5 o$5 '%% '! ' '!! o/ 3.0 1024
'*
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E. O$& o%& o/ '$ !*!t'$)& )o$t'#$! 6.02 1023'to!
O$& o%& o/ '$ !*!t'$)& )o$t'#$! 6.02 1023t#$5!. I/ t& t#$5 #! ' o%&)*%& t'$ o$& o%& )o$t'#$!
6.02 1023o%&)*%&!. I/ t& t#$5 #! 'to! t'$ o$& o%& )o$t'#$! 6.02 1023'to!.
CHEM 161- 2002 INAL EAM ANSERSCHAPTER 3 - STOICHIOMETRYATOMS" IONS" MOLES AND MOLECULAR EIJHTS21. T& $*&+ o/ 'to! #$ 1.000 o% o/ '%*#$* !*%/'t& #!
A. 6.022 1023
B. 1.700%024
C. 3.011%024
D. 1.024%02>
E. Coo!& t#! )o#)& #/ $o$& o/ t& ot&+! #! )o++&)t
A%2SO493; 17 'to!=o%&)*%&
St+'t&5: Co$&+t o%&! to o%&)*%&! t&$ o%&)*%&! to 'to!.
1.000 o% 6.022 1023o%&)*%&!=o%9 17 'to!=o%&)*%&9 ; 1.02 102>'to!
10.Chem 161-2003 Exam IChapter 3 - Stoichiometry
#oles and moleclar !ei"hts $hich o% the %ollo!in" represents the "reatest nm&er o% molecles'
A. 1.( mol )2* 1.( mol )e +. 66 " 2
C. 3.( mol o% S2 . 1 mol o% S E. 1.( x 1024molecles o% C2
mol / molecles)e is an atom, not a molecle.1.( mol )2x 6.022 x 10
23moleclesmol .03 x 1023molec
" / mol / molecles66 " 232 "mol-1x 6.022 x 1023moleclesmol 1.24 x 1024
mol / molecles3.( mol S2x 6.022 x 10
23moleclesmol 2.10 x 1024
mol / molecles1 mol Sx 6.022 x 10
23moleclesmol 6.022 x 1023 0.60 x 1024
1.( x 1024molecles o% C2 1.( x 1024molecles o% C2
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12.Chem 161-2003 Exam IChapter 3 - Stoichiometry
#oles and moleclar !ei"hts
5he mass o% one molecle o% Cl3is
A. 2.4 "
B. 1.(4x10-22"
C. .24x10-23" . (.(7 x 102(" E. (.44x10-22"
molecles / mol / mass1 molecle x 1 mol6.023 x 1023molecles x 3(.4(3 * 1. x 3"mol-1 1.(3 x 10-22"
161EXAMIV1
FA 2003 4
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EMPIR. MOLEC. ORMULAS
40. C& 161-2007 #$'% &'H#%%" P&t+*))# &t '%.CHAPTER 3A STOICHIOMETRY: CHEMICAL CALCULATIONSE#+. o%&). /o+*%'! '$( +&%'t&( !to#)#o&t+
A )oo*$( )o$t'#$! o$% C" H" N '$( O. Co*!t#o$ o/ 10.0 5 o/ t&)oo*$( +o(*)&! 11.7 5 CO2" 6.00 5 H2O '$( 1.
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2>. C& 161-2007 #$'% &'H#%%" P&t+*))# &t '%.CHAPTER 3A STOICHIOMETRY: CHEMICAL CALCULATIONSE#+. o%&). /o+*%'! '$( +&%'t&( !to#)#o&t+
Ho, '$ !*%/'t& #o$! '+& #$ 43.1 5 o/ '%*#$* !*%/'t&
A. >.>4 1023B. 2.08 1023
C. 7.>7 1022
D. 1.>1 1023
E. 2.2< 1023
A%2SO493 2A%3 3SO4
2-
43.15 #o$!
P%'$: 5 A%2SO493 o%A%2SO493 o%SO42- #o$!SO4
2-
A%*#$* !*%/'t& ; A%2SO492; 2 26.8.0 )%o+#(& '!!. 't #! t& 'to#) '!! o/ MA. 3>.> *B. 28.2 *C. 3>.< *
MC%4 M 4C%- 2>.05 7>.05
P%'$: 5C%- o%C%- o%M AM7>5 C%=3>.4>5o%-1 1o%M=4o%C%- ; 0.>28 o% Mo% ; 5=AAM ; 5=o%AM ; 2> 5=0.>28 o% ; 47.3 5=o%
D
26
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1 C& 161-2007 #$'% &'H#%%" P&t+*))# &t '%.CHAPTER 3A STOICHIOMETRY: CHEMICAL CALCULATIONSE#+. o%&). /o+*%'! '$( +&%'t&( !to#)#o&t+
B&$&$& '$( ')&t%&$& '+& (#//&+&$t !*!t'$)&! ,#t t& !'& +#)'%/o+*%'!. #) o/ t& /o%%o,#$5 #! t+*&
A. T+ o%'+ '!!&! ,#%% '& ' !#%& #$t&5&+ +'t#o.B. T+ o%&)*%'+ /o+*%'! '+& t& !'&.C. T+ !t+*)t*+'% /o+*%'! '+& !##%'+.D. T& '& !##%'+ ))'% +o&+t#&!.E. T& '& !##%'+ !#)'% +o&+t#&!.
B&$&$& #! C6H6 #t! +#)'% /o+*%' #! C1H1o+ CH.A)&t%&$& #! C2H2 #t! +#)'% /o+*%' #! C1H1o+ CH.
A. T+*&. T& o%'+ '!! o/ C6H6#! 7
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H#%%" P&t+*))# &t '%." 4t&(#t#o$C't&+ 3A Sto#)#o&t+: C)'% C'%)*%'t#o$!E#+#)'% o%&)*%'+ /o+*%'!23. #) /o+*%' cannot& '$ +#)'% /o+*%'
A. N'C%B. CH2O
C. C6H6O2D. C10H14NO2E. CO
A$ +#)'% /o+*%' #! ' o%&)*%'+ /o+*%' #$ ,#) t& !*!)+#t! '+& +&(*)&( to #$t&5&+! o/ t& %o,&!t)oo$ (&$o#$'to+. C6H6O2#! $ot +&(*)&( to #t! %o,&!t )oo$ (&$o#$'to+. It! %o,&!t )oo$(&$o#$'to+ #! C3H3O1; C3H3O.
C& 161-2007 E' IH#%%" P&t+*))# &t '%." 4t&(#t#o$C't&+ 3A Sto#)#o&t+E#+#)'% o%&). /o+*%'!>. #! t& '!! o/ o5&$ #$ )o*!t#o$ '$'%!#! (&t&+#$&( !*t+')t#o$ +'t&+ t'$ /+o t&o%&! o/ CO2'$( H2O +o(*)&(
A. It #! o+& )o$&$#&$t. Yo* )o*%( *!& t& CO2'$( H2O" *t t&+& #! %&!! 't #$o%&(.
B. B&)'*!& t&+& '+& 2 o5&$! #$ CO2'$( o$% 1 #$ H2OC. B&)'*!& o* $&&( to /#$( t& '!! o/ O #$ t& !'%&.D. B&)'*!& t& o%&! o/ o5&$ #$ t& !'%& #! &F*'% to t& o%&! o/ C t& o%&! o/ H.
E. B&)'*!& o$% !o& o/ t& o5&$ #$ t& CO2'$( H2O )'& /+o t& !'%&.
I$ )o*!t#o$ '$'%!#! o5&$ #! '%,'! +o#(&( to t& !'%& /o+ )o*!t#o$. H&$)&" #t #! $ot G$o,$,&t&+ t& o5&$ #$ t& +o(*)t &.5." CO2'$( H2O9 #! /+o t& o5&$ #$ t& !'%& o+ /+o t&o5&$ +o#(&( /o+ )o*!t#o$. T&+&/o+&" t& o5&$ #! $ot '$'%&(. It #! (&t&+#$&( )'%)*%'t#$5t& '!! o/ &') o/ t& ot&+ &%&&$t! t&$" #/ t& !* o/ t&!& '!!&! #! %&!! t'$ t& '!! o/ t&!'%&" t#! (#//&+&$)& #! '!!*&( to & t& o5&$ )o$t&$t.A9 '%!&. U!#$5 t& CO2'$( H2O '$'%!#! /o+ o5&$ )o$t&$t #! #$)o++&)t.B9 '%!&. I++&%&'$t.C9 '%!&. It #! t+*& t't o* $&&( to /#$( t& '!! o/ o5&$ #$ t& !'%&" *t o* )'$$ot /#$( t't/+o t& '!! o/ CO2o+ H2O.D9 '%!&. T& (#//&+&$)& &t,&&$ t& o%&! o/ C '$( t& o%&! o/ H #$ t& !'%& #! #++&%&'$t.E9 T+*&. O$% !o& o/ t& o5&$ #$ t& CO2'$( H2O )'& /+o t& !'%&. T& +&!t )'& /+o t&o5&$ t't ,'! *!&( /o+ t& )o*!t#o$.
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C& 161-2007 E' IH#%%" P&t+*))# &t '%." 4t&(#t#o$C't&+ 3A Sto#)#o&t+: C)'% C'%)*%'t#o$!
E#+#)'% '$( o%&)*%'+ /o+*%'!7. A )oo*$( #! >7.18 S '$( 42.85CO2=44.015CO2=o%CO299 1 o% C=o% CO29 12.015C=o% C9 ; 0.4
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'!! o/ N: 1.121 5 N2=2
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14 C& 161-2006 #$'% E'C't&+ 3 Sto#)#o&t+: C)'% C'%)*%'t#o$!E#+#)'% '$( o%&)*%'+ /o+*%'!
A )oo*$( o/ &%&&$t '$( )%o+#$& '! t& /o+*%' C%3. T#! )oo*$( #! 67.2
C% '!!. I(&$t#/ .A. A%
B. C+C. ND. &E. T
C%30.672 5 C%0.32< 5 o% C% ; 5=A ; 0.6725=3>.4>5o% -1; 0.01
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2 C& 161-2006 #$'% E'C't&+ 3 Sto#)#o&t+: C)'% C'%)*%'t#o$!E#+#)'% '$( o%&)*%'+ /o+*%'!
T& )o*!t#o$ o/ ' >.0005 !'%& o/ ' (+o)'+o$ #! *+$&( #$ &)&!! o5&$" #&%(#$5
1>.05 o/ )'+o$ (#o#(&. 't #! t& +#)'% /o+*%' o/ t& (+o)'+o$A. C2H>
B. C3H.0005 S 1>.0 5
5CO2 o%CO2 o%C#$CO2 5C#$CO2 5C#$HC 5H#$HC
[ [ o%C#$HC o%H#$HC
E#+#)'% /o+*%'
T& G& )o$)&t #! t't t& 5 o/ C #$ CO2#! t& !'& '! t& 5+'! o/ C #$ HC" t& %',o/ )o$!&+'t#o$ o/ '!!.1>.0 5 CO2=44.015o%
-1; 0.340< o% CO20.340< o% CO2 1 o% C=1o% CO29 ; 0.340< o% C #$ CO20.340< o% C 12.015 C=o% ; 4.083 5 C #$ CO2B t& %', o/ )o$!&+'t#o$ o/ '!!" t&+& *!t & 4.083 5 C #$ t& *$G$o,$ HC.
T&+&/o+&" t& 5 o/ H #$ HC ; >.000 4.083 ; 0.807 5 H4.0835 C=12.015o%-1 ; 0.340< o% C0.8075 H=1.01 ; 0.
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14 C& 161-2006 E' IH#%%" P&t+*))# &t '%." 4t&(#t#o$C't&+ 3 Sto#)#o&t+: C)'% C'%)*%'t#o$!E#+#)'% '$( o%&)*%'+ /o+*%'!" '$( &+)&$t )oo!#t#o$
't #! t& '!! o/ !o(#* #$ 30.0 5 o/ N'2HPO4
A. 4.
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11 C& 161-2006 E' IH#%%" P&t+*))# &t '%." 4t&(#t#o$C't&+ 3 Sto#)#o&t+: C)'% C'%)*%'t#o$!E#+#)'% '$( o%&)*%'+ /o+*%'!
#) o/ t& /o%%o,#$5 !t't&&$t! &!t (&!)+#&! '$ +#)'% /o+*%'A. It #! t& &&+#&$t'%% &'!*+&( $*&+ o/ &') 'to #$ ' o%&)*%&.B. T& +'t#o o/ )'+5&! o/ #o$! #$ #o$#) )oo*$(!.C. T& +'t#o o/ )oo*$(! #$ ' #t*+&.
D. T& !#%&!t" ,o%& $*&+ +'t#o o/ &%&&$t! #$ ' )oo*$(.E. T& !'%%&!t $*&+ $&&(&( to '%'$)& ' ))'% &F*'t#o$.
A. No. A%to*5 '$ +#)'% /o+*%' )o&! /+o '$ &&+#&$t'% &'!*+&&$t"t& '!!" $ot t& +#)'% /o+*%' $*&+!" #! ,'t #! ot'#$&( /+o t#!&&+#&$t'% &'!*+&&$t. T& +#)'% /o+*%' $*&+! #! t&$ )'%)*%'t&( /+ot& '!!.
B. No. o+ &'%&" #$ t& /o+*%' N'2SO3t& +'t#o o/ )'+5&! o/ #o$! #! 2:1" ,#)!'! $ot#$5 'o*t t& +'t#o o/ t& 'to!" ,#) #! 3:1:2.C. No. & '+& #$t&+&!t&( #$ t& +'t#o o/ 'to! #$ ' )oo*$(" $ot t& +'t#o o/)oo*$(! #$ ' #t*+& o/ )oo*$(!.D. Y&!" &.5." C2H3#! '$ +#)'% /o+*%'.E. No. A$ +#)'% /o+*%' '! $ot#$5 to (o ,#t '%'$)#$5 '$ &F*'t#o$.
D
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6 C& 161-200> Ho*+% E' IIC't&+ 3 - Sto#)#o&t+E#+#)'% '$( o%&)*%'+ /o+*%'!
Co*!t#o$ o/ ' (+o)'+o$ +o(*)&! 3.000 5 o/ CO2'$( 1.637 5 o/ H2O. 't #! t& +#)'%
/o+*%' o/ t& (+o)'+o$A. CH2B. CH3C. C2H3D. C3H4
E. C3HN3" )'$ & !#%#/#&( /*+t&+ toC4H>N" !o E #! $ot '$ +#)'% /o+*%'.
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30 C& 161-200> #$'% &'C't&+ 3 - Sto#)#o&t+E#+#)'% '$( o%&)*%'+ /o+*%'!A )oo*$( )o$t'#$! o$% C" H '$( O. Co*!t#o$ o/ 10.0 5 o/ t& )oo*$( +o(*)&!14.7 5 CO2'$( 6.02 5 H2O. 't #! t& +#)'% /o+*%' o/ t& )oo*$(
A. C2H3OB. CH2O2C. C3H4OD. C3H>O
E. CH2O
CHO O2 CO2 H2O10.0 5 14.75 6.025
It #! '!!*&( t't )o*!t#o$ #! (o$& ,#t '$ &)&!! o/ o5&$. H&$)&" (&t&+#$& F*'$t#t
o/ )'+o$ '$( F*'$t#t o/ (+o5&$" '$( t&$ (&t&+#$& F*'$t#t o/ o5&$ (#//&+&$)&.
P%'$: 5CO2 o%CO2 o%C 5C14.7 5 CO2 1 o%CO2=44.01 5CO29 1 o% C=1 o% CO29 12.01 5C=o%C ; 4.01 5 CP%'$: 5H2O o%H2O o%H 5H6.02 5 H2O 1 o%H2O =1
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C. C7H4O6D. C4H6O4
E. C6H4.>2
P%'$: 5 o%C: 40.8 5 1 o%=12.01 59 ; 3.41 o%H: 4.>< 5 1 o%=1.01 59 ; 4.>3 o%O: >4.>2 5 1 o%=16.00 59 ; 3.40< o%
E#+#)'% /o+*%':C3.41H4.>3O3.40 o% C0.270 5H2O 1 o%H2O=1H0.030; CH2
@UMDAHL >THEDITIONCHEM 161-2002 RECITATION 3RDEE
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C. M5P2O4 D. M52P3O< E. M5PO4
#$( t& O !*t+')t#$5 t& M5 '$( P /+o 100. T&$ )o$&+t '%% &+)&$t'5&! to o%&!.
T&$ )o$&+t o%&! to #$t&5&+!.
100 - 21.8 27.0.3 OM521.8P27.0.321.8 5 M5=24.30> 5 o%-1; 0.80 o% M527.< 5 P=30.874 5 o%-1; 0.0.3 5 O=16.00 5o%-1; 3.14 o% OM50.80P0. 5 o/ H2O" '$( 0.0421 5 o/ N2,&+& +o(*)&(. 't #! t& +#)'% /o+*%' o/ F*#$#$&
A. C10H20N2OB. C10H32NO2C. C8H23N2O2
D.C10H12NOE. C8H14N2O
\*#$#$& CO2 H2O N20.4 5 0.0421 5
P%'$:5 C #$ CO2: 5CO2 o%CO2 o% C 5CMCO2; 12.01 16.00 29 ; 44.01
1.321 5 CO2 1o%CO2=44.01 5 CO29 1 o% C=1o% CO29 12.01 5 C=o% C9 ; 0.360 5 C
5 H #$ H2O: 5H2O o%H2O o% H 5H0.32> 5 H2O 1 o% H2O=1
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0.0421 5 N2 1 o% N2=2
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17.
CHEM 161-2000 EAM I
@UMDAHL CHAPTER 3 - STOICHIOMETRYEMPIRICAL AND MOLECULAR ORMULAS
T& +o(*)t! o/ t& )o*!t#o$ #$ &)&!! O25'! o/ 3.42 5 o/ ' )oo*$( )o$t'#$#$5 o$% $#t+o5&$ '$((+o5&$ '+& NO2'$( H2O. I/ 8.7=12 ; 6.3
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CHEM 161-2001 SUMMER INAL EAM ANSERSCHAPTER 3 - STOICHIOMETRYEMPIRICAL AND MOLECULAR ORMULAS
37. $hich o% the %ollo!in" cold not&e an empirical %ormla'
A. Al2S3 B. C294
C. 9+rD. CHE. )a2Cr27
CHEM 161-2001 SUMMER-EAM I
@UMDAHL CHAPTER 3 - STOICHIOMETRYEMPIRICAL AND MOLECULAR ORMULAS
C& 161-S*01-E#+#)'% '$( o%&)*%'+ /o+*%'!6. 't #! t& +#)'% /o+*%' o/ ' )oo*$( t't #! 28.08 !o(#*" 40.>6 !*%/*+ '$( 30.3>o5&$ '!!
A. N'2S2O3B. N'3S4O3C. N'3S3O2D. N'2SO4E. N'2SO3
S#$)& o$% t& +'t#o o/ t& &+)&$t'5&! #! ,'t #! #o+t'$t" '+#t+'+#% )'%% t& &+)&$t'5&! 5+'!. H&$)&"28.08 !o(#* ; 28.08 5 !o(#*
AN'; 22.88AS; 32.066AO; 16.00
o%&! o/ N' ; 28.085 N' 1 o% N'=22.88 5 N'9 ; 1.26>o%&! o/ S ; 40.>6 5 S 1 o% S=32.066 5 S9 ; 1.26>o%&! o/ O ; 30.3> 5 O 1 o% O=16.00 5 O9 ; 1.0M*%t#% &') !&t o/ $*&+! 2; N'2S2O3; KA
4>
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CHEM 161-2001 SUMMER-EAM I
@UMDAHL CHAPTER 3 - STOICHIOMETRYEMPIRICAL AND MOLECULAR ORMULAS
20. A 1.>00 5 !'%& o/ )oo*$( )o$t'#$#$5 o$% C" H" '$( O ,'! *+$&( )o%&t&%. T& o$%)o*!t#o$ +o(*)t! ,&+& 1.73< 5 CO2'$( 0.711 5 H2O. 't #! t& +#)'% /o+*%' o/ t&)oo*$(
A. CH2O2
B. C2H4O3C. CH2OD. CHOE. CH4O
St+'t&5: 5CO2 o%&! CO2 o%&! C 5 C
5H2O o%&! H2O o%&! H 5 HTot'% 5 - 5C 5H9 ; 5O
5 C o%&!C5 H o%&! H5 O V o%&! O
MCO2; 12.01 2 16.009 ; 44.01 5M H2O ; 2 1.019 16.00 ; 10 o% O
M*%t#% &&+t#$5 2
E#+#)'% /o+*%' ; C2H4O3
46
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CHEM 161-2001-HOURLY EAM I ANSERS
@UMDAHL CHAPTER 3 - STOICHIOMETRYEMPIRICAL AND MOLECULAR ORMULAS
17. A 1.17-5 !'%& o/ ' #$'+ )oo*$( o/ $#t+o5&$ '$( (+o5&$ #! *+$&( )o%&t&% #$ &)&!! O2to /o+ NO2'$( H2O. T& '!! o/ NO2#! /o*$( to & 3.175.
T& +#)'% /o+*%' o/ t& )oo*$( #!:
A. NH B. NH2
C. NH3 D. N2H> E. N2H
NH O2 NO2 H2O
St+'t&5: '!!NO2 o%NO2 o%N '!!N '!!H o%Ho%N o%H +#)'% /o+*%'
M NO2; 46A N ; 14
3.17 5 NO2 1 o% NO2=46 5 NO29 1 o% N=1 o% NO29 ; 0.06
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T& +#)'% /o+*%' *!t & o$& -- ,#) ,&$ *%t#%#&( '$ #$t&5&+ -- +o#(&! t& M.T&+&/o+&" t& +#)'% /o+*%' )'$ o$% & 12
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@UMDAHL >THEDITIONCHEM 161-2002 RECITATION 3RDEECHAPTER 3 - STOICHIOMETRYEMPIRICAL AND MOLECULAR ORMULAS
3-121 o(.
A )oo*$( )o$t'#$! o$% )'+o$" (+o5&$" $#t+o5&$ '$( o5&$.Co*!t#o$ o/ 0.1>7 5 o/ t& )oo*$( +o(*)&( 0.213 5 CO2'$(0.0310 5 H2O. I$ '$ot&+ &&+#&$t" #t #! /o*$( t't 0.1>7 5 o/ t&)oo*$( +o(*)&! 0.03>1 5 NH3. 't #! t& +#)'% /o+*%' o/t& )oo*$(
CHNO S O2 CO2 H2O NH3
P%'$:19 #$( 5+'! o/ C" H '$( N. S*t+')t t#! /+o tot'% 5+'! to5&t 5+'! o/ O.29 #$( o%&! o/ C" H" N '$( O.39 #$( +#)'% /o+*%'.
C'+o$:0.213 5 CO2 12.01 5 C=44.01 5 CO29 ; 0.0>06 5 NH3 14.01 5 N=17.03 5 NH39 ; 0.02 5 H 0.02
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No, )o$&+t &') o/ t&!& F*'$t#t#&! #$to o%&!:0.0>03 C 2 ; 4.70061.6716 H 2 ; 3.34321.0000 N 2 ; 2.00002.021< O 2 ; 4.0436St#%% $ot #$t&5&+!.
T+ *%t#%#$5 &') 3:2.3>03 C 3 ; 7.0>081.6716 H 3 ; >.0144
>0
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C't&+ 3 - Sto#)#o&t+E#+ o%&). /o+*%'!&$ >.00 5 o/ ' )oo*$( )o$t'#$#$5 o$% C '$( H ,'! *+$&( )o%&t&% #$ &)&!! o5&$" 1>.0 5 o/)'+o$ (#o#(& ,'! #!o%'t&(. 't #! t& +#)'% /o+*%' o/ t& )oo*$(
A. C3H6B. C4H7
C. C3H
CH O2 CO2 H2O>.00 5 S 1>.0 5
P%'$: 5CO2 o%CO2 o% C 5 C 5 H o% H
1>.0 5=44.015=o%9 ; 0.3406.1 O '!!
A. A%2SO493B. A%SO2C. A%2S8O12D. A%2SO3E. A%SO3
A% S O0.1>2
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0.2060 o% O
A%1S1.486O>.8