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 100 kPa that contains 3 percent CO2 by volume. Under phase equilibrium conditions, the mole fraction of CO2 gas dissolved in water at 290 K is
(a) 2.3 x 10-4 (b) 3.0 x 10-4 (c) 0.80 x 10-4
(d) 2.2 x 10-4 (e) 5.6 x 10-4