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 200 grams of argon gas (M = 40) follows the process 1
2
3 as shown.
T
_{1}
= 38ºC and T
_{2}
= 658ºC
.
How many moles of helium are present in the container?
2.5 moles
10 moles
20 moles
1.25 moles
5 moles
omit
Question 2
In which process was heat removed from the gas?
no heat was ever removed during the cycle
1
2
2
3
3
1
omit
Question 3
What is the value of T
_{3}
?
1396.5 K
311.0 K
385.0 K
931.0 K
620.7 K
omit
Question 4
If P
_{1}
equals 190 kPa, then what is the value of P
_{2}
?
380 kPa
569 kPa
463 kPa
3290 kPa
omit
Question 5
What is the value of V
_{1}
?
2.72 x 10
^{3}
m
^{3}
1.02 x 10
^{0}
m
^{3}
6.8 x 10
^{-2}
m
^{3}
8.31 x 10
^{-3}
m
^{3}
1.47 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
.
38 joules of heat energy are transferred to a sample of gas along path AC. As a result, the internal energy of the gas
remains unchanged
increases by less than 38 J
increases by more than 38 J
increases by exactly 38 J
omit
Question 8
4.5 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)?
1045.4 m/sec
412.0 m/sec
16.5 m/sec
522.7 m/sec
omit
Question 9
While the temperature of the gas remains at 23ºC, the volume of the container is 0.076 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?
2.69 x 10
^{-21}
N
none of the numerical
values given are correct
5.38 x 10
^{-23}
N
1.94 x 10
^{-23}
N
1.08 x 10
^{-23}
AN
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