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2.39 The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of is to
by volume at
. The water is in equilibrium with air at a pressure of
At
. if the Henry’s law constants for oxygen and nitrogen at
are
and
respectively, calculate the composition of these gases in water
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We have been given that the water is in equilibrium with air at a pressure of 10 atm or 7600 mm of Hg.
So the partial pressure of oxygen :
and partial pressure of nitrogen :
Now, by Henry's Law :
For oxygen :
For nitrogen :
Hence the mole fraction of nitrogen and oxygen in water is
and
respectively.