The value of Henry's constant for CO₂ gas dissolved in water at 290 K is 12.8 MPa. Consider water exposed to atmospheric air at 90 kPa that contains 1.5 percent CO₂ by volume. Under phase equilibrium conditions, the mole fraction of CO₂ gas dissolved in water at 290 K is

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Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
H=12.8 "MPa"
P=0.09 "MPa"
y_CO2_air=0.015
P_CO2_air=y_CO2_air*P
y_CO2_liquid=P_CO2_air/H
"Some Wrong Solutions with Common Mistakes:"
W1_yCO2=P_CO2_air*H "Multiplying by H instead of dividing by it"
W2_yCO2=P_CO2_air "Taking partial pressure in air"

The Value of Henry's Constant for CO2 Gas Dissolved in Water

The Value of Henry's Constant for CO₂ Gas Dissolved in Water