
(a)
The final volume of the gas.
(a)

Answer to Problem 6SP
The final volume is 0.6 m3.
Explanation of Solution
Given info: The pressure of an ideal gas mixture is 1500 Pa and the temperature increased from 230 K to 920 K.
Write the equation satisfied by idea gas at two different pressure, volume and temperature
P1V1T1=P2V2T2 (1)
Here,
P1 is the initials pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
T1 is the initial temperature
T2 is the final temperature
The pressure is remains constant hence, P1=P2 thus, equation (1) will be rewritten as
V1T1=V2T2 (2)
Rearrange equation (2) to obtain an expression for final volume
V2=V1T2T1 (3)
Substitute 0.15 m3 for V1, 230 K for T1 and 920 K for T2 in equation (3)
V2=0.15 m3×920 K230 K= 0.6 m3
Conclusion:
The final volume is 0.6 m3.
(b)
The change in the volume for the process.
(b)

Answer to Problem 6SP
The change in the volume for the process is 0.45 m3.
Explanation of Solution
Write the expression for the change in volume
ΔV=V2−V1
Substitute 0.15 m3 for V1 and 0.6 m3 for V2 in the above equation
ΔV=0.6 m3−0.15 m3=0.45 m3
Conclusion:
The change in the volume for the process is 0.45 m3.
(c)
The work done by the gas on the surroundings during the expansion.
(c)

Answer to Problem 6SP
The work done by the gas on the surroundings during the expansion is 675 J.
Explanation of Solution
Given info:
Write the expression for work done in terms of volume and temperature
W=PΔV
Here,
W is the work done
ΔV is the change in volume
Substitute 1500 Pa for P and 0.45 m3 for ΔV in the above equation
W=1500 Pa×0.45 m3=675 J
Conclusion:
The work done by the gas on the surroundings during the expansion is 675 J.
(d)
The work done if the initial volume is 0.24 m3 and the same e temperature change is occurring.
(d)

Answer to Problem 6SP
The work done will not be same if final volume will be 0.72 m3, if the initial volume is 0.24 m3.
Explanation of Solution
Given info: The initial volume is 0.24 m3.
Write the expression for final volume
V2=V1T2T1 (1)
Substitute 0.24 m3 for V1, 230 K for T1 and 920 K for T2 in the above equation
V2=0.24 m3×920 K230 K=0.96 m3
Write the expression for the change in volume
ΔV=V2−V1 (2)
Substitute 0.24 m3 for V1 and 0.96 m3 for V2 in the above equation
ΔV=0.96 m3−0.24 m3=0.72 m3
Write the expression for the work done.
W=PΔV
Substitute 1500 Pa for P and 0.72 m3 for ΔV to find W.
W=1500 Pa×0.72 m3=1080 J
Conclusion:
Therefore, the work done will be 1080 J and the final volume will be 0.72 m3, if the initial volume is 0.24 m3.
(e)
To explain is the same amount of gas involved in these two situations.
(e)

Answer to Problem 6SP
The amount of gas involved in the two situations will be different.
Explanation of Solution
Write the expression for ideal gas equation
PV=NkT
Here,
P is the pressure
V is the volume
N is the number of molecules
k is the Boltzmann Constant
In this case, both pressure and temperature is remains as same, but there is a change in volume. According to the above equation, the number of molecules will be different for different values of V at constant pressure and temperature.
Conclusion:
Therefore, different amount of gas will be involved in both case since, the volume is changing at constant pressure and temperature the N will also change.
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Chapter 10 Solutions
The Physics of Everyday Phenomena
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