Jim Guinn’s PHYS2211 Assignment #20 Solutions
These problems are not to be turned in.
They are for you to study for the exam.
1.
An enclosed sample of ideal gas undergoes an isothermal (constant temperature) process.
Its initial volume is 3.00m
3
and its final volume is 5.50m
3
. What is its final pressure if its initial
pressure is 1.25atm?
For a sample of ideal gas undergoing an isothermal process, we know that "n" is held
constant, and "T" is held constant, with PV = nRT we have
P V = n R T = constant, so
P
i
V
i
= P
f
V
f
, so
P
f
= P
i
V
i
/ V
f
= (1.25atm) (3.00m
3
) / (5.50m
3
) =
P
f
= 0.682atm = 6.91x10
4
Pa .
2.
An enclosed sample of ideal gas undergoes an isobaric (constant pressure) process. Its
initial temperature is 17.0
o
C and its final temperature is 77.0
o
C. What is its final volume if its
initial volume is 1.75m
3
?
For a sample of ideal gas undergoing an isobaric process, we know that "n" is held
constant, and "P" is held constant, with PV = nRT we have
V / T = n R / P = constant, so
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 Spring '11
 lomant
 PF, Isochoric process

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