kg
of oxygen gas at two different
temperatures.
(a) What does the dotted plot signify?
(b) Which is true :
or 
?
(c)
What is the value of PV/T where the curves meet on the Y-axis?
(d)
H we obtained similar plots for 
of
hydrogen, would we get the same value of PV/Tat the point where the curves meet
on the y-axis ?If not. What mass of hydrogen yields the same value of PV/T (for
low pressure high temperature region of the plot) ? (Molecular mass of H = 
u, of 
u,
J 
Answer:
(a) The dotted plot shows that
is a
constant quantity, independent of pressure P. This signifies the ideal gas
behaviour.
(b)
The curve at temperature 
is
closer to the dotted plot than the curve at temperature
. As the
behaviour of a real gas approaches the behaviour of a perfect gas when
temperature is increased, therefore,
.
(c)
Where the two curves meet, the value Of PV/T on Y-axis is equal to 
R
As mass of oxygen gas = 
(d)
If we obtained similar plots for 
kg
of hydrogen, we will not get the same value of PV/T at the point, where the
curves meet on the Y-axis. This is because molecular mass of hydrogen is
different from that of oxygen.
For
the same value of 
,
mass of hydrogen required is obtained from
gram 
gram.
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