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NAME:
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PERIOD:
Q.3
HOMEWORK~
a.
b.
Review your notes.
Answer the following questions.
I. The compound methyl butanoate smells like apples. Its percent composition is 58.8% C, 9.8% Hand
31.4% O. Its molar mass is 102.0 g/rnol. Determine its empirical formula. Determine its molecular
formula.
c.
r , 58.8'
L
ra.e
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t
z:
z:
o
;J. S (CJ.)
s:
.s
14
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o ~ 1(,. e
3/, 1.(
C. ::
H
o
(5) 1d. 0 I -'=
(10) 1.01.:
=
o :;(2) 1(,.00
o
('0.0.5
/0.
I 0
:. 32.00
/O~.IS'
2. Muscle fatigue can result from the buildup of lactic acid resulting from over exercising. The percent
composition of lactic acid is 40.0% C, 6.67% Hand 53.3% O. Its molar mass is 90.0 glmo!. Determine the
empirical formula of lactic acid. Determine its molecular formula.
C
"10.0
::
.:;
3. '3 3
'fVvv)O
Z
s:
I
C
la.o\
0
H-
(,.(,7
-
H --
z
1.01
S3. 3
:;
f(,.O
o
(" ~ D
::
J,
33
-----.
CI-l.a.O
e,
.:
C
0
C
e.. ('0
:3. "3 ~
-=(1)1.).01
1+:
J
0
s:
(I)
lv, 00
C1~1..0
tm,..e: C 3 l~(, 0 :3
1~,OI
oL 0 a..
(.:l) 1.01:s:
: --
:
1('.00
.30,03
=- I
')C :
qD.O
eo,»
a
::t
3
3. Oxalic acid is a toxic substance used by laundries to remove rust stains. Its percent composition is
26.7% C, 2.2% Hand 71.1 % O. Its molar mass is 90.0 glmo!. Determine its empirical formula.
Determine its molecular formula.
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Ii " ..2 1" 1
e.
J. ~ J
\... 1.:1.01
= J. d. ).
H ~ ~
z:
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I
J. ~
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\
,...
o :: ('2.-)
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L/ S.
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1