Practice Problems
Confined Gases
Directions:
On this worksheet you will be examining properties of a confined ideal gas.
omit
Question 1
Use the following information for question 1-6 on this worksheet.
An enclosed gas of 120 grams of argon gas (M = 40) follows the process 1
2
3 as shown.
T
_{1}
= 39ºC and T
_{2}
= 655ºC
.
How many moles of helium are present in the container?
12 moles
1.5 moles
3 moles
6 moles
0.75 moles
omit
Question 2
In which process was heat removed from the gas?
2
3
no heat was ever removed during the cycle
1
2
3
1
omit
Question 3
What is the value of T
_{3}
?
382.0 K
928.0 K
312.0 K
618.7 K
1392.0 K
omit
Question 4
If P
_{1}
equals 150 kPa, then what is the value of P
_{2}
?
446 kPa
2519 kPa
300 kPa
423 kPa
omit
Question 5
What is the value of V
_{1}
?
6.48 x 10
^{-3}
m
^{3}
5.19 x 10
^{-2}
m
^{3}
2.08 x 10
^{3}
m
^{3}
4.8 x 10
^{-1}
m
^{3}
1.93 x 10
^{1}
m
^{3}
omit
Question 6
In which process was no work done on or by the gas?
2
3
3
1
1
2
omit
Question 7
The final three questions do
NOT
refer to the PV diagram shown in
Question #1
.
39 joules of heat energy are transferred to a sample of gas along path AC. As a result, the internal energy of the gas
increases by exactly 39 J
increases by less than 39 J
remains unchanged
increases by more than 39 J
omit
Question 8
9.0 grams of water vapor (M = 18.0) are confined in a cylindrical container having a movable, yet 'snuggly-fitting,' lid that slides up and down to accommodate changes in pressure and volume. What is the average velocity of a water molecule (H
_{2}
O) in the container if the vapor is at room temperature (23ºC)?
16.5 m/sec
522.7 m/sec
412.0 m/sec
739.2 m/sec
omit
Question 9
While the temperature of the gas remains at 23ºC, the volume of the container is 0.078 m
^{3}
. If the surface area of the lid of the container is 0.2 m
^{2}
then what is the magnitude of the force exerted against the lid by the gas molecules?
5.24 x 10
^{-23}
N
none of the numerical
values given are correct
1.05 x 10
^{-23}
AN
1.89 x 10
^{-23}
N
2.62 x 10
^{-21}
N
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