Consider a solution of 
dissolved in water in a closed container. Which one of the following plots correctly represents variation of 
(partial pressure of 
in vapour phase above water) 
-axis] with 
(mole fraction of 
in water) 
-axis 
at 
?
Text Solution
Verified by ExpertsB
According to Henry's Law, the partial pressure of a gas in the vapour phase 
is proportional to the mole fraction of the gas in the solution 
.
The mathematical expression is: 
where 
is the Henry's law constant.
Taking logarithm on both sides:
Comparing this with the equation of a straight line 
:
(y-axis)
(x-axis)
(slope)
(y-intercept)
Since 
for 
in water is a positive constant at 
will be a constant intercept.
The plot of 
vs 
is a straight line with a positive slope and a positive y -intercept.
This corresponds to graph .
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