Practice Problems
Confined Gases
Topics:
On this worksheet you will be examining properties of a confined ideal gas.
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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
= 34ºC and T
2
= 651ºC
.
How many moles of helium are present in the container?
20 moles
2.5 moles
10 moles
1.25 moles
5 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
?
378.0 K
616.0 K
307.0 K
1386.0 K
924.0 K
omit
Question 4
If P
1
equals 120 kPa, then what is the value of P
2
?
361 kPa
2298 kPa
240 kPa
393 kPa
omit
Question 5
What is the value of V
1
?
6.5 x 10
-1
m
3
1.18 x 10
-2
m
3
9.4 x 10
0
m
3
1.06 x 10
-1
m
3
4.25 x 10
3
m
3
omit
Question 6
In which process was no work done on or by the gas?
1
2
2
3
3
1
omit
Question 7
The final three questions do
NOT
refer to the PV diagram shown in
Question #1
.
34 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 34 J
increases by less than 34 J
increases by more than 34 J
remains unchanged
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)?
16.5 m/sec
522.7 m/sec
1045.4 m/sec
412.0 m/sec
omit
Question 9
While the temperature of the gas remains at 23ºC, the volume of the container is 0.068 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?
6.01 x 10
-23
N
none of the numerical
values given are correct
3.01 x 10
-21
N
2.16 x 10
-23
N
1.2 x 10
-23
AN
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T1 = 34ºC and T2 = 651ºC