Name
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Date
_
14. The chemical formula of aspirin is C9H004' What is the mass of 0.200 mol
of aspirin?
a. 22.5 g
b. 5.4 g
c. 80 g
~ . 36.0 g
0
I
~<£)~
_,_
~~O!11 13
;~
.
\
15. How many moles of S03 are in 2.4 x 1024molecules of S03?
a. 0.25
c. 4.0
b. 3.4 x 1022
.' 2.9 X 10-23
\
(1
\~
d,..'--t 't..l\)"L'fvV\~~O
11
~
-u..
f\
(0
\
G
12. How many hydrogen atoms are in 4 molecules of isopropyl alcohol,
C3H70?
/)
-,
a. 4 x (6.02 X 1023)
"-..>.-' 28
G_ b. 4
_
d. 28 x (6.02 x 1023)
__
17. The gram molecular mass ofoxygenffi:
a. equal to the mass of one mole of oxygen atoms.
~.
b. 16.0 g.
c, c 32.0 g.
d. none of the above
1
6.5
.
6.2
,
t ()r {)\e.,-S-G. ~
Vv,;'\:r
I,
13. The mass of a mole of NaCl is the:
.~
gram formula mass.
b. gram atomic mass.
."
V
",-:l- ~G8 t}0)
.~
.
r:
G
~\/
~
•
~
"Y.
Na2S04
G,;H,CI
~
'!..lO_
0-
t-k
J.-J., If t6.7
1
~
~
L. ~
~I'-\']....t\\
\A- :_ \0 '" \ .o \
_
_
-
db
",£
c;.,
llw.!
\8blov"'b ~
r
\.
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~t
0 -- \. ",llo' ~
~
crv
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\
(0 N2H4 \?lc. It CtlM ~rtAuceA
d. Sn,(PO,),
~
~ L-- ~
-1.130
62%
20.7%
22. Which of the following is not an empirical formula?
a.
b.
.
22.4 Llmol x 4 g He
7.00 x 102 L
mol
~x4gHe
22.4 Llmol
mol
'-/
6.8
~\B>\ ~
c.
20. The gram formula mass of a gas can be determined from:
a. the density of the gas at STP.
b. the volume of a mole of the gas.
c. Avogadro's number.
f"d. )none of the above.
~.
a. 1.60%
b. 30.0%
,--,7..5l·
gram molecular mass.
atomic mass.
....21. What is the percent by mass of carbon in acetone, C3HsO?
~
I
6.3
c.
d.
If i Ii'
\'\
_
,
6.4
19. A large weather balloon filled with helium has a volume of 7.00 x 102,L at
STP.Which expression should be used to find the ~s
of helium in the
balloon?
a. 22.4 L x 4 g He
mol
mol
b. 7.00 x 102 x4gHe
L
mol
_/1.
t~,.v
I.l vl..Nv
~
s-%' j
I,
_
0~
)!.~b
23. Which expression represents the percent by mass of nitrogen in NH4N03?'
~
to ~.9
''''=
a. 14.0 g x 100%
c. 80.0 g x 100%
•___
80.0 g
14.0 g
"1A b." 28.0 g x 100%
d. 80.0 g x 100%
'J...,"j-. \
_'J.5t I~"'_
~J80.0
g
28.0 g
\,
Ll l-. I ,0\ ,_ 4.1..;\.-{
@
N _
4
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D ::. ~ ) ....1)
-=- 'i~ .,co
- - ceo.c.b
64
Chapter Test A
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