Name
Section
b 14.
V
C
Date
The chemical formula of aspirin is CgHa04. What is the mass of 0.200 mol
of aspirin?
a. 22.5 g
c. 80 g
b. 5.4 g
d. 36.0 g
15. How many moles of S03 are in 2.4 x 1024 molecules
a. 0.25
c. 4.0
h. 3.4 X 1022
d. 2.9 X 10-23
of S03?
~-)\l.A~.'What
o
X
V
4
is the volume (in liters at STP) of 2.50 mol of carbon monoxide?
. a. 0.112 L
c. 56.0 L
b. 3.10 L
d. 8.96 L
17. The gram molecular mass of oxygen is:
_
6.5
6.3
6.6
6.4
a. equal to the mass of one mole of oxygen atoms.
b. 16.0 g.
c. 32.0 g.
d. none of the above
18. At
a.
b.
c.
d.
STP, 1 mol each of hydrogen, oxygen, nitrogen, and fluorine:
have different densities.
occupy different volumes.
are monatomic elements.
contain two times Avogadro's number of representative particles.
6.7
19. A large weather balloon filled with helium has a volume of 7.00 x 102 L at
6.8
STP.Which expression should be used to find the mass of helium in the
balloon?
c. 22.4 Llmol x 4 g He
a. 22.4 L x 4 g He
mol
mol
7.00 x 102 L
mol
2
2
b. 7.00 x 10
4 gHe
d. 7.00 x 10 Lx 4 g He
L
x mol
22.4 Llmol
mol
20. The gram formula mass of a gas can be determined
from:
6.7
the density of the gas at STP.
h. the volume of a mole of the gas.
c. Avogadro's number.
d. none of the above.
C
..~
-ci
a.
e~
.t:
eo
1:
~
:>.
21.What is the percent by mass of carbon in acetone, C3H60?
a. 1.60%
c. 62%
b.
30.0%
d.
6.9
'"E"c.
0
u
ec
c
20.7%
.~
:a
::l
0.-
022.
~
64
Which of the following is not an empirical formula?
a. Na2S04
c. N2H4
b. C6HsCl
d. Sn3(P04)4
23. Which expression represents
the percent by mass of nitrogen in NH4N03?
a.
14.0 g x 100%
80.0 g
c.
80.0 g x 100%
14.0 g
h.
28.0 g x 100%
80.0 g
d.
80.0 g x 100%
28.0 g
6.10
~
~
.:
~
"0
6.9
<
til!
Chapter Test A
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