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
= 36ºC and T
2
= 657ºC
.
How many moles of helium are present in the container?
0.75 moles
12 moles
3 moles
6 moles
1.5 moles
omit
Question 2
In which process was heat removed from the gas?
2
3
3
1
no heat was ever removed during the cycle
1
2
omit
Question 3
What is the value of T
3
?
620.0 K
930.0 K
309.0 K
384.0 K
1395.0 K
omit
Question 4
If P
1
equals 180 kPa, then what is the value of P
2
?
360 kPa
542 kPa
453 kPa
3285 kPa
omit
Question 5
What is the value of V
1
?
5.81 x 10
-1
m
3
1.71 x 10
3
m
3
4.99 x 10
-3
m
3
2.34 x 10
1
m
3
4.28 x 10
-2
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
.
36 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 more than 36 J
remains unchanged
increases by less than 36 J
increases by exactly 36 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
412.0 m/sec
739.2 m/sec
522.7 m/sec
omit
Question 9
While the temperature of the gas remains at 23ºC, the volume of the container is 0.072 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?
1.14 x 10
-23
AN
2.84 x 10
-21
N
none of the numerical
values given are correct
2.04 x 10
-23
N
5.68 x 10
-23
N
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