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Experiment 10: Gas Laws
General Chemistry I and II Lab Manual
Dakota State University
Page 128 of 232
rT
V
=
where r is some constant, or
r
T
V
=
Since r is constant for any two states 1 and 2, we can write
2
2
1
1
T
V
T
V
=
Unfortunately, there IS a problem with Charles.
See, if you have one of the temperatures set at zero, then the equation becomes
undefined.
How does one circumvent this problem? Well, Charles’ did so by extrapolating his
data all the way to V=0.
Such a condition, where the volume occupied by the gas is zero, is only
possible for an ideal gas, and since there are no ideal gases, this becomes a hypothetical limit.
It
is not possible, and yet, in this impossible situation, Charles’ noticed something wonderful; no
matter what gas, or mixture of gases he used, no matter what pressure he kept the gas, no matter
how many moles of gas he started with, these lines
all
extrapolated to
exactly the same
temperature
; 273.15
o
C.
No matter what he did, he could NEVER reach a temperature in his extrapolations below
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This note was uploaded on 01/27/2012 for the course CHM 2045 taught by Professor Josephwalter during the Fall '11 term at Dakota State.
 Fall '11
 JosephWalter
 Chemistry

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