scrushy (mgs972) – Oct 13 HW – sparks – (50975)
1
This
printout
should
have
7
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
Preview sections 5.6, 5.7, and 5.10 before
our next class.
001
10.0 points
A lungful of air (333 cm
3
) is exhaled into a
machine that measures lung capacity. If the
air is exhaled from the lungs at a pressure
of 2
.
19 atm at 47
.
6
◦
C but the machine is at
ambient conditions of 0
.
958 atm and 23
◦
C,
what is the volume of air measured by the
machine?
Correct answer: 702
.
831 cm
3
.
Explanation:
T
1
= 47
.
6
◦
C + 273 = 320
.
6 K
P
1
= 2
.
19 atm
T
2
= 23
◦
C + 273 = 296 K
P
2
= 0
.
958 atm
V
1
= 333 cm
3
Because
P
,
V
, and
T
change,
P
1
·
V
1
T
1
=
P
2
·
V
2
T
2
V
2
=
P
1
·
V
1
·
T
2
P
2
·
T
1
=
(2
.
19 atm) (333 cm
3
) (296 K)
(0
.
958 atm) (320
.
6 K)
= 702
.
831 cm
3
.
002
10.0 points
Which gas is most dense at 1 atm and 25
◦
C?
1.
nitrogen monoxide
2.
carbon monoxide
3.
nitrogen dioxide
correct
4.
hydrogen cyanide
5.
hydrogen sulfide
Explanation:
The ideal gas law is
P V
=
n R T
n
V
=
P
R T
with unit of measure mol/L on each side.
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 Fall '10
 McCord

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