Version 038 – Quiz 4 – sparks – (51150)
1
This
printout
should
have
5
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0points
What volume is occupied by 1.00 kg of helium
at 5.00
◦
C at a pressure of 735 Torr?
1.
5
.
90
×
10
3
L
correct
2.
1
.
06
×
10
2
L
3.
5
.
60
×
10
3
L
4.
2
.
95
×
10
3
L
5.
5
.
97
×
10
5
L
Explanation:
(1
.
00 kg He)
1000 g
1 kg
1 mole He
4
.
0026 g He
= 249
.
838 mol He
T
= 5
.
00
◦
C + 273
.
15 = 278
.
15 K
P
= (735 Torr)
1 atm
760 Torr
= 0
.
967105 atm
P V
=
n R T
V
=
n R T
P
=
(249
.
838 mol)(0
.
08206
L
·
atm
mol
·
K
)
0
.
967105 atm
×
(278
.
15 K)
= 5896
.
5 L
002
10.0points
What is the volume of 1.42 mol of ammonia
at STP?
1.
22.4 L
2.
0.0634 L
3.
31.8 L
correct
4.
541 mL
Explanation:
n
= 1.42 mol
Avogadro’s Law states that at the same
temperature
and
pressure,
equal
volumes
of
all
gases
contain
the
same
number
of
molecules.
The standard molar volume of
an ideal gas is taken to be 22
.
414 liters per
mol at STP.
22
.
4 L
mol
×
(1
.
42 mol) = 31
.
8 L
003
10.0points
Two tanks (tank A and tank B) of gas are
connected by a closed valve. Tank A is 5 liters
and contains O
2
gas at a pressure of 24 atm.
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 Spring '12
 SPARKS
 Mole, 1 mole, 5 liters

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