Review Key

Name
Hour
_
Mathematics of Chemical Formulas Review
Solve the following problems. You must show your work
1.
How many molecules of aluminum sulfate are in 17.1 grams of the compound? (Hint:"start by writing the
formula for aluminum sulfate.)
A\l~O~ \
I
,ff ~ ;;t(2.l.,q~)
+ 3(5(,01) + 12(Il"oo)
It.\, All.l50~~,I ~oL~l.cts~~\
_
:5~2.. lid
3.0:<~
:~.Ie~_
(i\~ CSO,/)a )"
10
~Ie,
(J
~(t
NLOs M
C'a
AlA 1400.:.-
~
:=
:? 333
2..)
YY\_
-
a
"HC~
'
I.
f
Z.(I~.CI)" 5(11.,,00) : 2.~,02-t ~O.~'" I0<6,02.a/f'llSl~z.Q5
\
\
\0 ~\;)~
\ f\'\Q\
Nz,~$~
N,<-Os;; ~-;':!3~l~
Nt-\;£,
Moles Review
-•...'-'" ~.~ "
I IV
rc
j" "COJ
How many liters of dinitrogen pentoxide are there in 5.90 x 1023 molecules at STP?
X
~-
N\ Y'I\" \ (n..9 q') + I.(~d + 12. C 1 +.30 £,.6b) ~ <64,013- tJe<HCG.,3
~<6,0'i 4\.Jt03
5..90
A'2.~)3
~o\ A Iz,CSDq)3
Find the number of moles represented in 28.0 grams of sodium bicarbonate.
No.. 'rl C0,3
3.
3'i2..lt~lh'\o)
t.,C2. ~IC').jf'(\O~u1,.~1z.(~~),1)
AI,(SOt£}3 \ \
:=: ~
2.
I
-=
}
Name
4.
Find the number of grams in 45.8 liters of carbon dioxide gas at STP.
C()2.(~) N\ W\::: I ~,G'
5.
Hour __
-t-
32, 00
~
"I~,
0I
a
002../t ~l tOl.
Which has the larger number of moles represented- 6.50 grams of gold or 6.50 grams of silver?
Moles Review
Name
Hour __
10. Among the following, which has the highest percent copper?
(a) Cu(N03)2
(b) CUS04
(C) CuCb
®CuC2H302
\, N\ 'N\ (,.{po,,),z
..13. 55'
')C
In,S1
~
\'t\ ~
~
s-3g~~~l'C
l.?0~~~_._u
=-
lOb
\5(1.51..
c..lz.
=
S5 + Z '6,02. + ql"uo
S<:J'i:: ~.3.S 5'
~
c.. ~
-= 103
.3 '2.,C
~
\ -+
15'~.51..
t '1. 6D
ll.fit> ""
13Q, ~~ -7•• Cu.l
..
-....1
\Il\'fI\:
"3. S5 -+ 2.i35. 'IS)
.fl
~
~
/ttJ cJ.jjJJ\
/~Ic SO 'I
lA
~ 13~, %1 / /'0..01 6...tf z,
~~'q5:sIt I liD :: )~ i',1.~~1.
A, tu G)·laO:!. fV\. : &3,5s' -I- 2..'-1. C2. -4.3.()~
(e~if
Iog"t. 5~~
·f)2,tm.,
\2.2,
lJf
r I'IIPI G..CtI4JOz
S ).<6Lf '% ~
_
J2:2. (,~ -
-.~.--
11. Arrange the following substances in order of the increasing percent of phosphorus.
(a) Na3P04
(b) PH3
(C) P40JQ
Cd) (NPCb)3
t.Jc\~9Gq tiM =
3lZZ.QQ)-l-
~.~:
P 1-13
'"
I'V( z
30, 91 -I-
3.?..
~:..} '-I. 0 ()..i
1-)f I Ob ~
y
ff\ V'I\:'
If.)
't
r \
~~~_~_!
__
,,3.__~-t
11"+ ) +
30.
1<"319
'"
11,3,q"a-/1 "" t
JJl<j~
E~~.~.~1
.~ I~:
f-f.;~
~ ()
30,q1:_~l"Lf.6
J 0 {I/,. fiD')
-+ Ii.e.\) :'
"
.p~
I
J8.3, C; 3-/~\
?q D,
i{~:~~. E3j~~~IJ
I~
LtJ t>Ch.).3 ~
iV\"
.~
3( N,OI
q-"2.. Gt I
3~'t,l....
Moles Review
) ~
..~
3L 30. iff) -I- t..{ 35, 'f S') :: 31.\ 1-.1.
- ~ l~
r-~I
i=~L .. ::r 3
01
to
p\
-------J
f·~~~.5\
Name
7.
Hour _' __
If 3.50 grams of iron react with 1.50 grams of oxygen, what is the empirical formula of the compound
formed? .
r~'\ " 0
,:3,50 ~ fe. Jl.l'<'IJl
,
,o{." ~
1- Mol
£ - ()0(., ~1-
-
X
\. S5.~~~ ~c- )
I. 503 0
L\ ~t00 ~.)
~I(P.(J()&-
z
,
a ,0q 3(1, ""'\ 0 '; Clot. L:t
- \, 50
l(
~20:
8.
An oxide of phosphorus is found to contain 43.5% P. If its molecular mass is 284.0g, find its molecular
formula.
IDt), D 't; - ~3, 5
~3.5/i
v
SL.58 0
2.-
2 .::
r \?'J.
I~
\
Lii-? P )
L I"""[
~)
=:
0 \::
5L S 7. 0
·
1.~ 0 ~\) l
= 2..
P -: L ~ G ::
,3" 53 ""'\(j "; J 'i (J
fz. 05
z:
~.
S1..
l"'L') , 5
2-

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