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.

Explanation

The vapour pressure of air over water = 10 atm. The partial pressure of `N_(2)` and `O_(2)` are :
`P_(N_(2)) = (79 xx 10)/(100) = 7.9 atm`
`= 7.9 xx 760 mm = 6004 mm Hg`
`P_(o_(2))=(20 xx 10)/(100) = 2.0 atm`