If the solubility of gas in water is 5.0g/L when the pressure of the gas about the water is 2.0 atm, what is the pressure of the gas above the water when the solubility of the gas is 1.0 g/L?
it is nearly an direct relationship,
p1/P2=solubiity1/solubility2
P1=2*1/5= .4 atm