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The air is a mixture of a number of gase...

The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of `20%:79%` by volume at `298K`. The water is in equilibrium with air at a pressure of `10atm` At `298 K` if Henry's law constants for oxygen and nitrogen at `298 K` are `3.30 xx 10^(7)mm` and `6.51xx10^(7)mm`, respectively, calculate the composition of these gases in water.

Text Solution

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Calculation of partial pressure of oxygen and nitrogen.
Partial pressure of `O_(2)(P_(O_(2)))=(10atm)xx20/100=2 atm`
Partial pressure of `N_(2)(P_(O_(2)))=(10atm)xx79/100=7.9 atm`
Composition of `O_(2) and N_(2)` dissolved in waer
The amount of gases dissoved in water is calculated in terms of their mole fraction.
`x_(O_(2))=P_(O_(2))/K_(H)=((2xx760mm))/((3.30xx10^(7)))=4.46xx10^(-5)`
`x_(N_(2))=P_(O_(2))/K_(H)=((7.9xx760mm))/((6.51xx10^(7)))=9.22xx10^(-5)`
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