a. What is the maximum possible composition (as mole fraction) of Oxygen (O2) di

Question

a. What is the maximum possible composition (as mole fraction) of Oxygen (O2) dissolved that could be dissolved in the water, x*A?
b. What is the maximum possible molar concentration of oxygen (O2) that could be dissolved in water, c*AL?
29.3 A wetted-wall tower is used to "aerate" water using air at 2.0 atm total system pressure and 20°C. The molar composition of air is 2 1 %2,78% N2, and 1 % other gases. Let solute A =2. At 20°C, the Henry's law constant for dissolution of O2 gas in water is H = 40.100 atm based on the definition /Ai-HM,is inition pA.HXA,i and the mass density of liquid water is 1000 kg/m3 What is the maximum possible composition (as mole frac- tion) of oxygen (O2) dissolved that could be dissolved in the a. water, x?

Explanation / Answer

Partial pressure of oxygen PAi = 0.21*2= 0.42 atm

Given PAi= H*XA*

0.42= 40100*XA

XA= 0.42/40100=1.04738*10-5

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